020-0012-10b2 C3 Manual - · PDF fileRSM-2 Remote Sense Microphone ... Analog input meter...

C3CROWDCOMP™

TRUE AMBIENT SENSING

CROWD COMPENSATING COMPUTER

INSTRUCTION MANUAL© 1997-2003 LynTec

LynTecPROFESSIONAL AUDIO EQUIPMENT

LynTec, Inc.

8401 Melrose Drive Lenexa, KS 66214 U.S.A.Voice 800-724-4047 or 913-529-2233FAX 888-722-4157 or 913-529-4157

www.LynTec.com

The LynTecCROWDCOMP™

always knows when to SPEAK UP

BENEFITS

Automatically rides sound system gain

Follows fastest sports crowd dynamics

Eases sound operator’s work load

Maintains maximum speech intelligibility

Effective in large or small, indoor or outdoor facilities

Provides higher intelligibility for advertising audio

Improves neighborhood relations for outdoor stadiums,The sound system is loud only when the crowd is loud

Proven in sports venues and industrial applications

The LynTec C3 — a TRUE AMBIENT SENSING, CrowdCompensating Computer.

Proven automatic level compensation based on the measurement of true ambient noise.

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CONTROLS AND INDICATORS

RSM-2Remote Sense Microphone

(one supplied)

RSM-2 mounted in CEM-2optional Conduit End Mount

R1 R2 R3 R4 R5 R6 R7

CONFIGURATIONGround to select

B or C.

B C

Defaults to A with

no grounds.

TEMPERATURE COMPENSATION

Hi85°

Lo35° BY

PASS

MAX

IMUM

EXP

AND

REMOTE CONTROLGround to select

function.

SENSEMIC#1in

+– +–

SENSEMIC#2in

CROWD NOISE OUTPUTfrom SENSE MIC #1

PROGRAM LINE AUDIO(to be expanded by ambient noise) MAIN PROCESSOR

RD-1 REMOTE DISPLAY CONNECTIONS

BYPASSrelay

Defaults to Temp. Normal

withno grounds.

600Ω in / 600Ω out, load output with 600Ω for BYPASS level consistency.See manual for unbalanced load connections.NEVER GROUND output pins 4 or 5.

GAIN EXPAND CONTROL

+– +–

CH

AS

SIS

CH

AS

SIS

CH

AS

SIS

CH

AS

SIS

CH

AS

SIS

IN OUTDATARed

STROBEYellow

CLOCKGreen

BrownBlue

PROGRAMMING SECURITY LOCK

Press once to UNLOCK.Press again to LOCK.

Locking saves programmed parameters.System will automatically LOCK after 2 minutes of

programming inactivity, securing your programming.

146-

0057

-01

RD-1 Remote Display

Mounts at the mix position to give sound system operatorcontinuous indication of how much gain the CROWDCOMP™

is adding to the system in response to crowd noise.Provides at-the-board access to BYPASS and MAXIMUM EXPAND.

Analog input metershows all inputlevels

PROGRAMMINGSELECTOR SWITCH

BYPASSswitch provides

full hard-wire bypass.

Shows which mic's output isstrongest

and is being usedas the active sensor.

Indicates gain added in responseto ambient noise change.

GAINEXPANDED BY

AMBIENT NOISE

MAXIMUM EXPANSION1.5 to 24 dB

DECAY0.1 to 99.9 sec.

THRESHOLD70 to 110 dBA

ATTACK0.1 to 99.9 sec.

The 92 dBA crowd noise at SENSE MIC 1 input expands the gain 9 dB.EXAMPLE with EXPANSION THRESHOLD set at 83 dBA and RATIO at 1 to 1.

Operating parameters may be easily changed anytime...

even on the fly, to tailor the CROWDCOMP’s performance.

UL/CSA listed power supply.Attached and out of the way to reduce rack clutter.

139-0146-00.2

The most importantparameter...to un-expand gain

when the crowd falls silent.

The 2nd most importantparameter...to rapidly expand

gain when the crowd roars.

WHAT IT DOES

The CROWDCOMP™ automatically increasessound system level in direct relation to theambient noise level changes.

By closely tracking the crowd, a more constantsignal to noise ratio is achieved. The soundsystem is loud only when the crowd is loud.

HOW IT DOES IT

First a simple, automatic, one minute, one-timecalibration is run to determine the unique time/frequency profile of the sound system and theacoustics of the room, stadium or arena.

This calibration cycle feeds two sets of9 different frequency click pulses through thesound system (9 clicks for each microphone).The built-in calibration click pulses are veryshort (8 msec.) and vary in frequency from 150Hz to 3600 Hz...from a kick-drum thump to abird-cheep.

One or two sense microphones pick up all of thereturns of these click pulses. The returns arecomprised of delayed direct sound from theloudspeakers and reflections at various otherdelay times depending on room surfaces andreverberation.

A real-time FFT (Fast Fourier Transform)spectrum analysis is performed on all of thereturns to make up a room time/frequencyprofile. This time/frequency profile, stored innonvolatile memory, is the reference that theCROWDCOMP uses to ignore any sound that isintroduced into the room by the sound system.

The CROWDCOMP’s continuous FFT analysis ofthe signals fed to the sound system, versusthe continuous FFT analysis of the audiosensed in the room, provides a superiormethod of ignoring the sound system’scontribution to the room.

The remaining audio that is not source related;delayed direct sound, reflections andreverberation, is true ambient noise.

Accurate measurement of the true ambientnoise is the basis for the CROWDCOMP’sunerring gain control tracking of the crowd.

The real-time FFT capability of the CROWD-

COMP provides the computing speed andaccuracy necessary to track sports crowddynamics.

The CROWDCOMP makes level correctingdecisions 40 times a second, accuratelycorrecting for every impulse of the crowd.

As the job list shows...The CROWDCOMP is thechoice of professionals worldwide.

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ORDERING INFORMATIONModel

Number Description

C3 LynTec CROWDCOMPensating Computer.Includes one RSM-2 Remote Sensing Microphone.

OPTIONS

RSM-2 Remote Sensing MicrophoneA dynamic lavalier omnidirectional microphone. EV 649B.One supplied with CROWDCOMP™ to guarantee dBA scale accuracy.Two may be used for wide variations in crowd concentration.

CEM-2 Conduit End Mount for RSM-2 microphone.Black Delrin® plastic housing to mount microphone on the end of 1/2” conduit.

RD-1 Remote DisplayIndicates GAIN EXPANSION and provides remote control of MAXIMUM EXPANDand BYPASS. Supplied with horizontal faceplate installed. Easily changed verticalfaceplate inside case. Powered by supplied, UL & CSA listed, plug-in power supply.7 ft. flat cable and surface mounted modular interface block supplied.

TS-2 Temperature SensorTo automatically temperature compensate for speed of sound changes prevalent inlong-throw outdoor installations where delay between the main loudspeaker clusterand the sense microphone is more than 500 milliseconds. (>460 ft.)Consists of two thermostats mounted on single-gang blank switch plate.

www.LynTec.com 8401 Melrose Drive Lenexa, KS 66214, U.S.A.Voice 800-724-4047or 913-529-2233 Fax 888-722-4157 or 913-529-4157

139-0146-00.3

Architect’s and Engineer’sSpecifications

The Ambient Noise Compensating Computer shall controlthe gain expansion level of a sound system in responseto ambient noise.

The device shall have an gain expansion range of 0-24dB in digitally controlled 1.5 dB steps. The device shall befield programmable to begin expansion from a thresholdsound pressure level of 70 dBA to 110 dBA in 1 dB steps.

The device shall be programmable to provide attack anddecay times of 0.1 second to 99.9 seconds.

Calibration shall be semiautomatic consisting of clickpulses from 150 Hz to 3600 Hz and shall be accom-plished without any requirement for program audio.

Calibration results shall be stored in nonvolatile memory.To prevent tampering, changes from all front panelcontrols except BYPASS shall be automatically lockedout after 2 minutes of programming inactivity.

The device shall be housed in an 3.5" (2U) high allaluminum, rack mountable housing, utilizing all stainlesssteel hardware, and shall fit a standard 19" rack.

The Ambient Noise Compensating Computer shall be theLynTec model C3.

A dynamic sense microphone shall be provided with asensitivity of -61 dB (0 dB = 1 mW/10 dynes/cm2).

The sense microphone shall be the LynTec RSM-2mounted in a LynTec CEM-2 Conduit End Mount housingto mount on 1/2" conduit.

Simplified Stadium Sound System Block Diagram using the CROWDCOMP™

3

LynTecC3 CROWDCOMP™

SenseMic #1RSM-2SUPPLIED

SenseMic #2OPTIONAL 20

19

18

17

1615

Crowd noise outputLo Z, unbalanced.0 dBm out @ 107 dBA.

Crowd Noise for Press Box,Private Suites, etc.May also be used to supplementambient noise for Sound System Operator.

1.5 dB to 24 dBGAIN EXPANSION

ANNOUNCER

OPTIONALLINE

BUFFEREQ

EQ PWR

13

1

2

4

5

T35°F

85°FT

LO

HI

Common6

9

10

7

8

6

A

B

C

C3 has a 3configuration memory.

Defaults to configuration A if none are grounded.

ROOM or SYSTEMCONFIGURATION

SELECTORfor multi-use systems.

22 ga. shielded pair3,000 ft. max.

All control lines:22 ga. / 3,000 ft. max.

PWR

PWR

EQ PWRDELAY

MAINCLUSTER

UNDER-BALCONY(shielded seats)

Gnd

GndGnd

Gnd


CROSSOVER

Wall Plug-in SupplySupplied with RD-1.

SLATE

ORANGE

BLACK

RED

GREEN

YELLOW

BLUE

BROWN

Black/White

Black 12 v com

+12v

C3 ChassisGround

Data

Clock

Strobe

MAXEXPAND

BYPASS

R1, R4 or R5

R3

R6

R7

11

12

Three 2 conductor shieldedor

one 5 conductor shielded.22 ga., 3,000 feet max. run.

C3 ChassisGround

Data

Clock

Strobe

MAXEXPAND

BYPASS

MAIN PROCESSORReal time FFT

SLATE

BROWN

YELLOW

GREEN

RED

BLACK

ORANGE

BLUE

8 conductorModular Interface

Terminal Block(surface mount)

Supplied with RD-1.

7 ft, 8conductormodularmale tomalecable.

Suppliedwith

RD-1.

139-0146-00.3c ovrprnt

RD-1Remote Display

SYSTEMMIXER

LynTec TS-2Temperature Sensor

Required only if main cluster ismore than 460 ft. from sense

microphone/s.

Mounts on a single gang box.Locate in shaded area tosense outside ambient air

temperature.

6

9

12

15

18

21

24

1.5

MAXIMUM

EXPAND

ACTIVE

BYPASS

3

LynTec

dBGAIN

EXPANSION

CROWDCOMP™

TWOFACEPLATES

SUPPLIED

The RD-1 isshippedwith a

Horizontalfaceplateinstalled.

OPTIONAL

CompressorDO NOT usecompressionon output ofCROWDCOMP

Typical optional field installed indicator LED.May be used in any control line,

terminals 7 thru 12.LED current: 20 ma.

5.0"

+

–

+

–

Example: Movable cluster

SENSE MICROPHONE LOCATIONThe location of the sense microphone/s is not critical.

It is best to locate the microphone as close to the AVERAGE crowdas possible but far enough away so that individual shouters will beintegrated into the crowd.

For instance; if you know where the band is located, youprobably wouldn't want a sense microphone too close to thembecause they contribute more sound (noise) than the average crowd.

The CROWDCOMP™ responds to the loudest microphone.

MOUNTINGINDOORS: RSM-2 microphone is normally hung by its 30 footcord from an overhead catwalk or structure.

OUTDOORS: RSM-2 microphone may be mounted out of windblasts and rain under an overhanging structure.

Optional CEM-2 Conduit End Mount houses microphone in black,high strength, Delrin housing to mount on the end of 1/2" conduit.


4

Controlled ChannelOne per CROWDCOMP unit.

GAIN EXPANSION characteristics:Expansion range: 0 to 24 dB in 1.5 dB steps.

PROGRAM LINE INPUT (to be expanded) characteristics:Maximum input level: 0 dBm (to guarantee full 24 dB expansion range).

Input Impedance, in ACTIVE mode: 600Ω, transformer balanced.

Input Impedance, in BYPASS mode: 600Ω, hard-wired by an internalrelay to the output.

PROGRAM LINE OUTPUT (to be expanded) characteristics:Output Impedance: ≤30Ω, Electronically balanced. DO NOT ground.

Desired output load impedance: The output should be terminated with600Ω to guarantee BYPASS level consistency.

Maximum output level: +24 dBm. (12.25v RMS)

CONTROLLED CHANNEL FREQUENCY RESPONSE40 Hz to 20 kHz, ±1 dB.

TOTAL NOISE & DISTORTION≤0.3% , 20 Hz to 30 kHz, at 24 dB expansion, 1 kHz, 0 dBm input.

FRONT PANEL CONTROLS

INPUT METER SELECTOR slide switch:This 3 position slide switch selects the input to the INPUT LEVELS analogbar graph meter. The top and bottom positions show the activity of theSENSE MICROPHONES. The center position displays the PROGRAMLINE INPUT level. The INPUT LEVELS meter is a monitor indicator onlyand is independent of the CROWDCOMP digital gain expansion system.

PROGRAMMING SELECTOR SWITCHThis rotary switch selects the field programmable parameters of theCROWDCOMP. The display reads the programmed value of each position.

The parameters are locked to prevent tampering but may be changedwith the INCREMENT or DECREMENT DISPLAY buttons after theUNLOCK button on the rear is pressed.

Any of the programmable parameters may be changed on the fly whilethe system is operating, updating within 50 milliseconds. Programming islocked-out after two minutes of switch inactivity.

PROGRAMMING SELECTOR SWITCH functions:EXPANSION THRESHOLDCrowd noise level where gain expansion begins.

Field programmable from 70 to 110 dBA (peak responding).

EXPANSION ATTACKTotal time required for gain to expand to the programmed MAXIMUMEXPANSION limit. (linear)

Programmable range: 0.1 sec. to 99.9 sec.

EXPANSION DECAYTotal time required for gain to un-expand from the programmedMAXIMUM EXPANSION limit to zero. (linear)


EXPANSION RATIO - SENSE to OUTPUTThe ratio of sensed crowd noise to gain expansion.

Programmable range: 0.5 to 1.5 dB gain expansion per dB of sensedchange.

EXPANSION RATIO examples:Example 1A 1 dB = 0.8dB setting will produce an under-expanded gain change ofonly 0.8 dB for a sensed ambient noise change of 1.0 dB. Under-expansion is useful when the headroom of the sound system is limitedand some control is desired over a wider range, or when a 1 to 1 levelchange is perceived by the sound system operator as overcompensation.(Usually because he isn’t hearing full crowd noise due to his isolatedlocation [use sense microphone #1 output for ambient fill]).

Example 2A 1 dB = 1.0 dB setting will accurately expand the gain in directproportion to the sensed crowd noise. A 6 dB change in sensed ambientnoise will produce a 6 dB gain expansion.

Example 3A 1 dB = 1.2 dB setting will produce an overexpanded gain change of 12dB for a sensed ambient noise change of 10 dB. Overexpansion is usefulwhen the ambient noise has an especially high masking capability and anincrease in the signal to noise ratio is desired. (rarely used)

MAXIMUM EXPANSIONFront panel programmable from 1.5 to 24 dB in 1.5 dB steps.

Useful to keep the gain expansion just below system clip point.

A MAX EXPAND terminal allows the sound system operator to fullyexpand the CROWDCOMP system gain by remote control to establish fieldmicrophone levels. While talking the system, and the CROWDCOMP set atMAX EXPAND, the field microphone level is set just below feedback.

MAX EXPAND is implemented with the LynTec RD-1 Remote Display ora momentary action switch convenient to the sound system operator.

CALIBRATETo determine the time/frequency response of the complete sound system,including the room or environment that follows the CROWDCOMP, anautomatic click-pulse calibration is performed.

Assuming the system is UNLOCKed, switching to the CALIBRATEposition initiates the automatic click-pulse calibration cycle after a 5second countdown.

Switching out of the CALIBRATE position during calibration stops theclick pulses and aborts the calibration.

CALIBRATION PULSE characteristics:

Click pulses 8 milliseconds wide, having a peak amplitude of +6 dBm aregenerated internally and fed to the output during calibration. The ninedifferent click-pulses range in frequency from 150 Hz to 3600 Hz,sounding like a kick-drum thump to a bird cheep.

Because the click pulses are so short, their relatively high amplitude isnot objectionable. Calibration is normally performed with the facilityunoccupied which is usually a worst-case situation from a reflection/reverberation standpoint. The click pulses are so inoffensive thatcalibration may be accomplished even with the facility fully occupied.

With no program line audio input present, a set of calibration pulses issent through the system for each sense microphone.

The delayed and reflected calibration pulses received by the sensemicrophones provide the CROWDCOMP with a total system time/frequencyprofile.

The time/frequency profile received by each microphone and the fieldprogrammed performance parameters are stored in nonvolatile memory.A “single configuration” 18 pulse calibration cycle lasts 59 seconds.

CONFIGURATION STATUSThis switch position reads the present CONFIGURATION of the system;A, B or C. Three different sets of room parameters may be stored in theCROWDCOMP and called up with external switch contacts when the soundsystem configuration changes.

Example: An arena loudspeaker cluster is moved to three differentpositions or configurations. Each of these positions have a different time/frequency profile.

A calibration series is run for both sense microphones in each of thethree positions.

Grounding the appropriate configuration terminal on the rear of the unittells the CROWDCOMP which configuration the sound system is in andwhich set of calibration parameters to use. If none or more than one aregrounded the CROWDCOMP defaults to configuration A.

For troubleshooting, green indicator LEDs located behind each barrierstrip terminal, light when the line is grounded. An additional series LEDmay also be located at the configuration switch for visual confirmation ofswitch action.

BYPASS switchThe panel mounted BYPASS switch provides a complete hard-wirebypass of the CROWDCOMP. When the bypass switch is depressed, itlatches mechanically, and the internal bypass relay falls into an un-energized state, connecting the line input to the output.

The green EXPANSION SYSTEM ACTIVE front panel LED extinguishesin BYPASS.

AC power removal automatically bypasses the CROWDCOMP by thismechanism. Bypass may be accomplished remotely with a switch closureto ground. A red LED located behind the BYPASS barrier strip terminalindicates when the line is grounded.

DISPLAYS

INPUT LEVELS horizontal bar graph:The INPUT LEVELS LED bar graph display indicates the output of eithersense microphone or the program line level input as selected by theINPUT METER SELECTOR switch.

Range of SENSE MICROPHONES 1 & 2 display: 80 dBA to 107 dBA,peak responding, using the LynTec sense microphone.

Range of PROGRAM LINE INPUT display: -17 dBm to +10 dBm.

The yellow LEDs advise caution on the PROGRAM LINE INPUT.

Exceeding a 0 dBm input limits the maximum expansion range.

Example: The maximum expansion of the CROWDCOMP is 24 dB. Themaximum output level is +24 dBm. A +6 dBm input expanded 24 dBwould clip the output badly, but if MAXIMUM EXPANSION were set at+18 dB, the output would be OK

The red LED indicates where the line input will clip.

CENTER WINDOW DISPLAY

ACTIVE SENSE MIC.The two yellow LEDs indicate which sense microphone is being used toprovide ambient sensing information. The CROWDCOMP uses themicrophone having the highest ambient level. When there is little ambientnoise present, the LEDs flash alternately at a random rate.

When no calibration data is available, neither sense mic. indicator willlight.

dB GAIN EXPANSIONThe green LEDs above the alphanumeric display show the gain added bythe CROWDCOMP in response to the change in ambient noise level.

FACILITY DELAY REFLECTOMETERThe 10 character alphanumeric vacuum fluorescent display is used as aprogram parameter display and as a vertical bar-graph for the FacilityDelay Reflectometer. (FDR)

The vacuum fluorescent display automatically dims during programminginactivity to extend life, returning to full brightness as soon as a control ischanged.

FDR functions:The FDR display shows the return results of a calibration click pulse.

A click pulse is sent through the system. All of the responses at the clickfrequency; direct returns, reverberation, and reflections received by thesense mic. are displayed for an instant before the next click pulse.

Holding the FDR display for examination:

The display may be held for inspection by pressing the button.

While still holding down the button, pressing the button displays theclick frequency that generated the display.

As soon as the button is released, calibration continues with the nexthigher frequency click pulse. Each frequency click pulse usually willproduce a different FDR display, reflecting the time/frequency profile ofthe sound system in the facility.

Time displayed [horizontally]: 0 to 1.25 sec. in 25 msec. increments.

Amplitude displayed [vertically]: 72 to 108 dBA in 6 dB increments.

The FDR is a valuable analytical tool for reading sense microphoneperformance, room parameters, and delays.

REMOTE DISPLAY

The RD-1 Remote Display shows the sound system operator thedynamics of the CROWDCOMP’s GAIN EXPANSION and provides remotecontrol access to the MAXIMUM EXPAND and BYPASS functions.

The LED’s in the RD-1 are automatically dimmed by an ambient lightsensor.

The RD-1’s flat-pack design is field convertible to vertical or horizontalmounting. Intended to mount on or near the sound system console, theRD-1 is fed data and power via a 7 ft., 8 conductor modular telephonecable.

The modular cable is terminated by an modular interface, connecting tothe remote cabling and a supplied small plug-in local power supply.

REAR PANEL CONTROL

UNLOCKThe UNLOCK button unlocks the system so that programming may bechanged via the front panel rotary switch and the INCREMENT andDECREMENT DISPLAY buttons. The system automatically locks aftertwo minutes of programming inactivity.

REAR PANEL CONNECTIONS

Input/Output terminations: 3-48 slotted head screw activated wireclamping terminal blocks at rear of unit.

AUDIO PROGRAM TO BE EXPANDED600Ω BALANCED TRANSFORMER INPUTThe line input audio, typically from a mixer or line amplifier.

Input Impedance: 600Ω. Max. level: 0 dBm for full 24 dB expansion.

BALANCED OUTPUTThe expanded line output is typically connected to equalizer feeds.

This output should be terminated in 600Ω and should NOT be grounded.To feed an unbalanced load: Connect from either output terminal tochassis ground. Leave the other output terminal UNGROUNDED.

The sensitivity of the system following the CROWDCOMP is important. Thesystem should be set to clip with an input of +10 dBm. (2.45v RMS)

Any change in gain settings following the CROWDCOMP must beaccompanied by a new calibration run.

The calibration pulses have a peak level of +6 dBm.

CONFIGURATION B & C control linesThree nonvolatile memory locations are used to store calibration data.Reflections and return delays are generated by a click pulse calibrationrun. Useful when cluster is moved. The default memory is A.

Grounding either B or C CONFIGURATION terminal selects anothermemory location.

TEMPERATURE COMPENSATIONTemperature sensing and automatic compensation is required when theCROWDCOMP is operated in long-throw outdoor applications having morethan 500 milliseconds of delay between the sense microphones and themain loudspeaker cluster. (>460 ft.)

TS-2 temperature sensor contains a LO TEMP [35°F] and HI TEMP[85°F] thermostat mounted on a single position aluminum blank switchcover. Mount in a shaded location to sense outside ambient temperature.Wiring connections are crimped push-on terminals.

Once the system is calibrated, preferably between 50°F and 70°F,thermostat action will command a calculated calibration change which istransparent to the user.

Wiring requirements: One 22 ga. shielded pair. 5,000 ft. maximum run.

LO TEMPConnected to 35° thermostat. (Part of TS-2 temperature sensor).

A Green indicator LED located behind the barrier strip terminal, lightswhen the remote thermostat closes below 35°F.

HI TEMPConnected to 85° thermostat. (Part of TS-2 temperature sensor).

A Green indicator LED located behind the barrier strip terminal, lightswhen the remote thermostat closes above 85°F.

SENSE MICROPHONE INPUTS #1 and #2

Electronically balanced microphone inputs for LynTec RSM-2microphones. (E-V 649B)

Input impedance: 150Ω. Sensitivity: 240 microvolts = 94 dBA.

SENSE MICROPHONE #1 OUTPUTAn auxiliary output from sense microphone #1 to supply sensed crowdnoise for sound operator’s room and elsewhere.

This output is single ended, low impedance, at line level.

Output: 0 dBm at 107 dBA. Clip: 125 dBA. Output impedance: ≤50Ω.

REMOTE DISPLAY OUTPUTSSeven screw terminals for driving the RD-1 Remote Display.

Wiring requirements: 5 active lines plus ground; 22 ga., 1,500 ft.maximum run.

CABLE ROUTING CAUTION: A 500 Hz, 5v peak triangular wave isimpressed on 3 of the 5 lines. DO NOT route with microphone levelcables.

MICROPROCESSORS

The C3 uses two microprocessors; 10 MHz, 68000 & 11 MHz, 8749.

MECHANICAL

19.00" wide, 3.5" high, 10.0" max behind mounting surface.

1.0" maximum frontal projection from mounting surface.

Weight: 8 pounds.

ENVIRONMENTAL

Temperature: Operating 0°-140°F.

Humidity: 0-90% Non-condensing.

POWER REQUIREMENTSStandard Model 85-135VAC, 50/60Hz, 25 watts maximum.

OVerseas model 225VAC ±10%, 50/60Hz, 25 watts maximum.

6 ft, 3 wire line cord attached. NO power switch.

SAFETY APPROVALSThe standard 100/120 volt 50/60Hz power supply attached to the side ofthe C3 is UL & CSA listed.

The plug-in power supply supplied with the RD-1 is UL listed.

FCC DATAThe C3 meets the class A EMI/RFI requirements of FCC part 15.

Due to product improvement specifications are subject to change without notice

DETAILED SPECIFICATIONS

www.LynTec.com 8401 Melrose Drive Lenexa, KS 66214, U.S.A. Voice 800-724-4047 or 913-529-2233 Fax 800-724-4047 or 913-529-4157139-0146-01.4


1020-0012-10.1

LynTec CROWDCOMP™

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TABLE OF CONTENTS

Brochure ................................................................................ a-d

Table of Contents ...................................................................... 1

Product Description................................................................... 2

Remote Display illustration........................................................ 3

Simplified Stadium Sound System Block Diagram.................... 4

Rear Panel Connections & Labelling ........................................ 5

Controls and Display Functions BOLD FACE = Panel designations

INPUT LEVELS meter .......................................................... 6

LOCK & UNLOCK................................................................. 7

EXPANSION THRESHOLD & EXPANSION ATTACK. ......... 8

EXPANSION DECAY & EXPANSION RATIO. ...................... 9

EXPANSION RATIO examples ........................................... 10

MAXIMUM EXPANSION. .................................................... 11

CALIBRATE. ....................................................................... 12

FACILITY DELAY REFLECTOMETER. .............................. 13

CONFIGURATION STATUS................................................ 14

ACTIVE SENSE MIC., dB GAIN EXPANSION,EXPANSION SYSTEM ACTIVE & BYPASS. ...................... 15

TS-2 Temperature Sensor .................................................. 16-17

Sense Microphone Mounting Detail ........................................ 18

Detailed Specifications....................................................... 19-21

Architect's & Engineer's specifications.................................... 22

Field Programming Setup Record sheets ............................... 23

Warranty.................................................................................. 24

RSM-2/CEM2 Sense Microphone specification sheets ..... 25-26

© 1997-2003 LynTec – The entire contents of this manual are copyrighted by LynTec.

None of the material may be reproduced or stored in any medium without written consent.

To go to:click blue

underlinedpage number

020-0012-10.2

LynTec CROWDCOMP™

2 o Back to Table of Contents

PRODUCT DESCRIPTION

The LynTec CROWDCOMP™ is a true ambient sensing crowdcompensating computer.

WHAT IT DOES

The CROWDCOMP™ automatically adds gain to the sound rein-forcement system in direct relation to the ambient noise levelchanges.

By closely tracking the crowd, a more constant signal to noise ratiois achieved. The sound system is loud only when the crowd is loud.

HOW IT DOES IT

First a simple, automatic, one minute, one-time calibration is run todetermine the time/frequency profile of the sound system and theacoustics of the room, stadium or arena.

This calibration cycle feeds two sets of 9 different frequency clickpulses through the sound system (9 clicks for each microphone).The built-in calibration click pulses are very short (8 msec.) and varyin frequency from 150 Hz to 3600 Hz.... from a kick-drum thump toa bird-cheep.

One or two sense microphones pick up all of the returns of theseclick pulses. The returns are comprised of delayed direct soundfrom the loudspeakers and reflections at various other delay timesdepending on room surfaces and reverberation.

A real-time FFT (Fast Fourier transform) spectrum analysis isperformed on all of the returns to make up a room time/frequencyprofile. This time/frequency profile, stored in non-volatile memory,is the reference that the CROWDCOMP™ uses to ignore any soundthat is introduced into the room by the sound system.

The CROWDCOMP's continuous FFT analysis of the signals fed to thesound system, versus the continuous FFT analysis of the audiosensed in the room, provides a superior method of ignoring thesound system's contribution to the room.

The remaining audio that is not source related, delayed directsound, reflections and reverberation, is true ambient noise.

Accurate measurement of the true ambient noise is the basis forthe CROWDCOMP's unerring gain control tracking of the crowd.

The real-time FFT capability of the CROWDCOMP provides the com-putational speed and accuracy necessary to track the crowd indynamic conditions inherent to sporting events.

3020-0012-11.3

LynTec CROWDCOMP™


6

9

12

15

18

21

24

1.5

MAXIMUM

ACTIVE

BYPASS

3

LynTec

dB GAIN

EXPANSION

CROWDCOMP™

dB GAIN EXPANSION

3 6 9 12 15 18 21 24

LynTec CROWDCOMP™ Crowd Compensating Computer

1.5ACTIVE

BYPASS

MAXIMUM

EXPAND

EXPAND Mounting 4" x 5" adhesive backed Velcro is supplied for attachment to an appropriate smooth surface.

The RD-1 may be screw mounted for security by drilling through removed covers. Be sure the mounting surface is FLAT so covers will not distort when the mounting screws are tightened.

Before you drill.......There is sufficient internal clearance for screw heads.

These 4 holes are provided in the internal chassis for screw head clearance. Use this sheet as a drill template for the cover.

The RD-1 is shipped with the horizontal faceplate installed.

A vertical faceplate is taped insidecover.

The faceplate is easily field changed by removing covers.

8 pin modular jack. A 7 ft. black flat cable with modular plugs attached is supplied as standard. (Longer modular cables are optional). The other end of the modular cable plugs into a supplied Modular Interface which provides screw terminals for connection to wiring back to equipment rack containing CROWDCOMP™. Wiring requirements: Three 2 conductor shielded or one 5 conductor shielded, 22 ga., 3,000 feet maximum run.Power for the RD-1 Remote Display is provided by a supplied plug-in, UL listed, power supply which also connects to the Modular Interface.

REAR VIEW

Finish: Covers and back: Satin textured black epoxy paint.Faceplate: Matte black Mylar.

Cut on trim line to make drill template to fit inside cover.

Provides the sound system operator with continuous indication of the CROWDCOMP's performance and at-the-board access to maximum expansion and bypass.

RD-1 REMOTE DISPLAY for LynTec CROWDCOMP™

3.960"

5.000"

020-0012-11.3.eps

0.960"

Amber LED indicates that the CROWDCOMP is ACTIVE.

Will not light until the system is calibrated.

AutoDim photosensor. Senses ambient light and automatically controls brightness of all LEDs.

Green LEDs indicate the amount of gain added by the CROWDCOMP™ in response to ambient noise or activation of the MAXIMUM EXPAND switch.

Amber LED flashes when CROWDCOMP™ is latched in the MAXIMUM EXPAND mode.

Alternate-action switch (push-push) forces the CROWDCOMP™ to maximum programmed gain expansion.

Allows sound system operator to pre-set field, floor or wireless microphone levels just below feedback at maximum expansion.

Alternate-action BYPASS pushbutton switch provides inaudible, full hardwire bypass of CROWDCOMP™. BYPASS is also available at the rack.

GAIN EXPANSION

LEDs when BYPASSed.

Alternating action flashing of every other GAIN EXPANSION LED indicates when the CROWDCOMP™ is in BYPASS, de-activated by this switch or by the BYPASS switch in the rack mounted CROWDCOMP™.

RD-1 REMOTE DISPLAYfor

LynTec CROWDCOMP™Crowd Compensating Computer

www.LynTec.com800-724-4047

1 8

020-0012-11.4

LynTec C

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Back to T

able of Contents

Black/White

See Page 16

SenseMic #1RSM-2SUPPLIED

SenseMic #2OPTIONAL 20

19

18

17

16

15

ANNOUNCER

SYSTEMMIXER

EQ

EQ

13

1

2

4

5

T35°F

85°FT

LO

HI

Common6

9

10

7

8

6

A

B

C

ROOM or SYSTEMCONFIGURATION

SELECTORfor multi-use systems.See page 14.


All control lines:22 ga. / 3,000 ft. max.

EQDELAY

MAINCLUSTER

UNDER-BALCONY(shielded seats)

Gnd

GndGnd

Gnd


CROSSOVER

Wall Plug-in SupplySupplied with RD-1.

SLATE- 1

ORANGE- 2

BLACK- 3

RED- 4

GREEN- 5

YELLOW- 6

BLUE- 7

BROWN- 8

Black12 v com

+12v

C3 ChassisGround

Data

Clock

Strobe

MAXEXPAND

BYPASS

R1, R4 or R5

R3

R6

R7

11

12

Three 2 conductor shieldedor

one 5 conductor shielded.22 ga., 3,000 feet max. run.

C3 ChassisGround

Data

Clock

Strobe

MAXEXPAND

BYPASS

MAIN PROCESSOR

WHITE

ORANGE

BLACK

RED

GREEN

YELLOW

BLUE

BROWN

Data at24 dB

Expansion

1 msec.

100 msec.

+5v

Gnd

020-0012-11.4.eps

Using one Remote Display to monitor two or more CROWDCOMP's.

R3

R6

R7

11

12

C3 ChassisGround

Data

MAXEXPAND

BYPASS

Strobe

Clock

C3#2

C3#1

R3

R6

R7

Data

MAXEXPAND

BYPASS

Strobe

Clock

11MAXEXPAND

BYPASS12

Built-in diodes allow each C3's internal BYPASS switch to be operated independently

without interaction.

ChassisGround

ChassisGround

Data

Strobe

Clock

R1, R4 or R5

R1, R4 or R5

CROWDCOMP 1 / CROWDCOMP 23PDT switch

Simplified Stadium Sound System Block Diagram using the LynTec CROWDCOMP™

146-0058-04

RD-1 Remote Display

Mounting position optional. May be mounted with Velcro supplied or by screws through field drilled holes in cover. (The cover is yours when you drill it)!

Remove covers, drill & mount cover to FLAT surface, taking care not to distort cover. Avoid switches, heat-sink and modular connector areas where screw heads would interfere.

Note: The 4 screw head clearance holes in chassis pan are for left-edge-vertical or top-edge-horizontal (under-counter) mounting. See page 3.

TWO FACEPLATES SUPPLIED

The RD-1 is shipped with a Horizontal faceplate installed. A Vertical faceplate is taped inside cover.

To change faceplate:

Remove top & bottom cover by removing button-head screws. Requires .063 Allen wrench (Xcelite bit #21).

Lift off faceplate and replace with other faceplate taped inside cover. Re-tape unused faceplate inside cover for future use and replace covers.

Fumble-finger Note: The board is held down with additional button-head screws if you lose one.

NOTEFlat cable wire

colors are NOT the same as Interface Block wire colors

LynTec TS-2Temperature Sensor

Required only if main cluster is more than 460 ft. from sense microphones.

Mounts on a single gang box.Locate in shaded area to senseoutside ambient air temperature.

Crowd Noise for Press Box,Private Suites, etc.May also be used to supplementambient noise for Sound System Operator.

Crowd noise output Lo Z, unbalanced. 0 dBv out @ 107 dBA.

7 ft, 8 conductor modular

male to male cable.

Supplied with RD-1.

8 conductor Modular Interface

Terminal Block (surface mount)

Supplied with RD-1.

SENSE MICROPHONE LOCATION

The location of the sense microphone/s is not critical.

It is best to locate the mic. as close to the AVERAGE crowd as possible but far enough away so that individual shouters will be integrated into the crowd.

For instance; if you know where the pep club normally sits, you probably wouldn't want a sense mic. too close to them because they aren't the average crowd.

The CROWDCOMP™ responds to the loudest microphone.

See page 18 for mechanical.

Typical optional field installed indicator LED. May be used in

any control line, terminals 7 thru 12. LED current: 20 ma.

NOTE

Wire colors within interface block have

changed several times due to vendor changes.

Rely on cover label for correct colors.

LynTecC3 CROWDCOMP™

1.5 dB to 24 dB GAIN EXPANSION

EQ

CompressorDO NOT use compressionon output of CROWDCOMP.

OPTIONALLINE

BUFFER

C3 has a 3 configuration memory.

Defaults to configuration Aif none are grounded.

to RD-1 via Modular Interface

Terminal Block

PWR

PWR

PWR

PWR

1 8


5020-0012-10.5

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ontents

MAIN PROCESSORMAIN PROCESSORPROGRAM LINE AUDIO

(to be expanded by ambient noise)

1 4

R2 R3 R4 R5 R6 R7

BYPASSrelay

600Ω in / 600Ω out, load output with 600Ω for BYPASS level consistency.See manual for unbalanced load connections.NEVER GROUND pins 4 or 5.

GAIN EXPAND CONTROL

+– +–

CH

AS

SIS

CH

AS

SIS

IN OUT

7 8 9 10 11 12 13 14 15 16 17 18 19 20

CONFIGURATION

Ground to selectB or C.

B C

Defaults to A with

no grounds.

TEMPERATURE COMPENSATIONTEMPERATURE COMPENSATION

Hi85°

Lo35° BY

PASS

MAX

IMU

M E

XPAN

D

REMOTE CONTROLGround to select

function.

+– +–

#2 in

CROWD NOISE OUTPUTCROWD NOISE OUTPUTfrom SENSE MIC #1from SENSE MIC #1

CH

AS

SIS

CH

AS

SIS

CH

AS

SIS

2 3 5

Defaults Defaults to Temp. to Temp. Normal Normal with no with no

grounds.grounds.

SENSE MIC#1 in

SENSE MIC

RD-1 REMOTE DISPLAY CONNECTIONSPress white button m to insert stripped wire.

146-0233-00

DATA STROBECLOCK

6

INPUT600Load

Lo Z. OUTPUT

Output at0 dB

Expansionis 6 dB belowinput

Connections for unbalanced

source and load.

020-0012-10.5.eps

REAR PANEL LABELLING


020-0012-10.6

LynTec CROWDCOMP™


Controls and Display Functions

Analog INPUT LEVEL meter

The bar graph LED indicator provides ameans for checking the input levels of theCROWDCOMP.

The analog input meter is independent ofthe digital signal processing.

When the INPUT METER SELECTORswitch is in either the top or bottom position,the LEDs indicate the correspondingSENSE MICROPHONE activity.

The top scale indicates the dBA level whenusing the supplied RSM-2 sense micro-phone. The response is A weighted and theLEDs are peak responding.

When the INPUT METER SELECTORswitch is in the center position the LEDsindicate audio activity on the PROGRAMLINE INPUT (to be expanded).

The bottom scale numbers reflect the RMSdBm value of the line input.

80 83 86 89 92 95 98 101 104 107

-17 -14 -11 -8 -5 -2 +4 +7 +10+1

INPUT LEVELS

PROGRAMLINE INPUT

(to be expanded)

dBA

SENSEMICROPHONES

1

2

dBm

INPUTMETER

SELECTOR

During calibration the click pulses are indi-cated on the PROGRAM LINE INPUT indi-cator and typically light all LEDs through +4dBm during the click.

LED COLOR SIGNIFICANCE

The LED colors have significance only onthe PROGRAM LINE INPUT.

The yellow +1, +4, & +7 LEDs indicate thatcaution should be exercised if these LEDslight on the PROGRAM LINE INPUT.

The maximum output level of theCROWDCOMP is +24 dBm. If you expectto use a maximum expansion of 24 dB, theinput must not exceed 0 dBm.

The red +10 dBm LED indicates that youhave reached the clipping level of the PRO-GRAM LINE INPUT.

7020-0012-10.7

LynTec CROWDCOMP™


Controls and Display FunctionsCONTINUED

Automatic LOCK prevents tampering

The CROWDCOMP's auto-lock feature locksout the knob-turners and button-pushers.

No security covers are necessary. If youhave a rack key, you have access. Thereare no unlock codes to remember.

Anyone can move the controls to see theinput levels or programmed parameters buta Locked message appears if they tryto change an operating parameter.

No changes may be made until theUNLOCK button on the rear of the unit ispressed. Pressing it once UNLOCKs thesystem, allowing programming changes.Pressing it again LOCKs the system

The CROWDCOMP auto-locks after two min-utes of programming inactivity.

Whenever the system locks, the CROWDCOMP

stores your settings in non-volatile memory.

When you get the

Lockedmessage......

press theUNLOCK

button on therear of the unit.

EXPANSION RATIO - SENSE to OUTPUT

EXPANSION THRESHOLD

EXPANSION ATTACK

EXPANSION DECAY MAXIMUM EXPANSION

CALIBRATE

CONFIGURATIONSTATUS

Locked


EXPANSION THRESHOLD

EXPANSION ATTACK


CALIBRATE

CONFIGURATIONSTATUS

UNLOCKED

020-0012-10.8

LynTec CROWDCOMP™



UP / DOWN buttons

The INCREMENT andDECREMENT buttonschange the parameterthat is selected with theProgramming Selectorswitch.

Programming Selector switch

The rotary switch selects the field pro-grammable parameters.

EXPANSION THRESHOLD

Crowd noise level where gain expansionbegins. Field programmable from 70 dBAto 110 dBA (Peak responding)

EXPANSION ATTACK

Total time required for gain to expand tothe programmed MAXIMUM EXPANSIONlimit. (linear)


Typical settings:

Baseball: 1.0 to 1.5 Sec.Football & Basketball 0.5 Sec. to 1.0 Sec.







EXPANSION THRESHOLD

EXPANSION ATTACK


CALIBRATE

CONFIGURATIONSTATUS

0.8Sec.

GAINEXPANDED BY

AMBIENT NOISE


EXPANSION THRESHOLD

EXPANSION ATTACK


CALIBRATE

CONFIGURATIONSTATUS

82dBA

INCREMENTDISPLAY

DECREMENTDISPLAY

9020-0012-10.9

LynTec CROWDCOMP™



EXPANSION THRESHOLD

EXPANSION ATTACK


CALIBRATE

CONFIGURATIONSTATUS

0.5Sec.




GAINEXPANDED BY

AMBIENT NOISE




EXPANSION DECAYTotal time required for gain to un-expandfrom the programmed MAXIMUM EXPAN-SION limit to zero. (linear)


Typical settings:

Baseball: 0.8 to 1.5 Sec.Football & Basketball: 0.3 Sec. to 0.8 Sec.

EXPANSION RATIO(SENSE to OUTPUT)

The ratio of sensed crowd noise to gainexpansion.

Programmable range: 0.5 to 1.5 dB gainexpansion per dB of sensed change.

Typical settings: Best: 1dB=1.0 dB, but....

politically it may be necessary to set it to less

than 1 to 1.

See Examples on next page.


EXPANSION THRESHOLD

EXPANSION ATTACK


CALIBRATE

CONFIGURATIONSTATUS

1dB=0.9dB

THRESHOLD

OVER-Compensated

1dB=1.2dB

CROWD NOISE

1 dB =0.7 dB

UNDER-Compensated

020-0012-10.10

LynTec CROWDCOMP™



EXPANSION RATIO examples:Example 1

A 1dB=0.8dB1dB=0.8dB1dB=0.8dB1dB=0.8dB1dB=0.8dB setting will produce an under-expanded gain change of only0.8 dB for a sensed ambient noise change of 1.0 dB. Under-expansion isuseful when the headroom of the sound system is limited and some controlis desired over a wider range.

Under-expansion is sometimes required due to politics, human nature, orlack of understanding or a combination of all three.

For instance: A one to one level change may be perceived by the stadium orarena sound system operator as over-compensation.

Real reason #1: First, he has difficulty setting the sound system gain lowenough when there is no crowd noise. Before the CROWDCOMP, the gainalways had to be set loud.... even when there was no crowd.

The operator wanted to be ready for the eventual increase in crowd noise.He knew he'd probably be busy cueing carts or cassettes or something elsewhen the increase happened, so set it loud.....sort of a CYA (cover youraudio). [This will probably be a tough habit to break, keep trying]

With the CROWDCOMP riding gain, the quiet level of the sound systemshould be set 6 to 10 dB above normal conversation level, NOT the20 dB or more that he's used to...... before automatic compensation.

Then let the CROWDCOMP do its thing.......COMPensate for the CROWD!Second, most sound system operators are more or less isolated from thecrowd. This isolation prevents them from hearing as much noise as thecrowd hears. When the CROWDCOMP senses a 12 dB crowd noise changeand responds with a 12 dB expansion, the operator feels that theCROWDCOMP is over-compensating........ and the rub is, He's right!! If thesense microphone were located in the booth, it would compensate lessbecause of his diminished crowd noise, but we aren't compensating for himare we? Gotta get him into the crowd !!!!!!

An alternative is to use the sense microphone #1 output to feed a poweramp to drive a crowd noise loudspeaker in the sound operator's booth.Bring the crowd to him! Unfortunately, we feel that most busy operators willfind additional crowd noise objectionable. What's an acceptable alternative?

A few minutes spent listening to the system while sitting in the crowd, nearthe sense mic., will give the operator a better feel for the CROWDCOMP'sperformance at the optimum one to one ratio, if he still feels it's too much trya lower ratio, say 0.7 with a lower threshold and a higher max. expansion.

Example 2A 1dB=1.0dB1dB=1.0dB1dB=1.0dB1dB=1.0dB1dB=1.0dB setting will accurately expand the gain in direct proportion tothe sensed crowd noise. A 6 dB change in sensed ambient noise willproduce a 6 dB gain expansion.

Example 3A 1dB=1.2dB1dB=1.2dB1dB=1.2dB1dB=1.2dB1dB=1.2dB setting will produce an over-expanded gain change of 12dB for a sensed ambient noise change of 10 dB. Over-expansion is usefulwhen the ambient noise has an especially high masking capability and anincrease in the signal to noise ratio is desired.

ObservationSports announcersreally get into the excite-ment of the game. Theirlevel increases with theexcitement and they areaccustomed to having toshout to be heard.The announcer should becompressed heavily toprevent double compen-sation.

1dB=0.8dB

1dB=1.0dB

1dB=1.2dB

11020-0012-10.11

LynTec CROWDCOMP™



MAXIMUM EXPANSIONFront panel programmable from 1.5 to 24 dBin 1.5 dB steps.

Useful to keep the gain expansion justbelow the system clip point.

A MAX EXPAND terminal allows thesound system operator to fully expand theCROWDCOMP system gain by remote controlto establish field microphone levels.

While talking the system, with theCROWDCOMP set at MAX EXPAND, the fieldmicrophone level is set just below feedback.

MAX EXPAND is implemented with theLynTec RD-1 Remote Display or a momen-tary action switch convenient to the soundsystem operator.


EXPANSION THRESHOLD

EXPANSION ATTACK


CALIBRATE

CONFIGURATIONSTATUS

+15.0dB




GAINEXPANDED BY

AMBIENT NOISE



As long as the momentaryswitch is held in this position.

ProgrammedMAXIMUM EXPANSION

GAIN Expanded remotely by MAX EXPAND switchto set field mic. gain

020-0012-10.12

LynTec CROWDCOMP™


CALIBRATETo determine the time/frequency response of thecomplete sound system, including the room orenvironment that follows the CROWDCOMP, anautomatic click-pulse calibration is performed.Assuming the system is UNLOCKed, switchingto the CALIBRATE position initiates the auto-matic click-pulse calibration cycle after a 5second countdown.Switching out of the CALIBRATE position duringcalibration stops the click pulses and aborts thecalibration.


Click pulses 8 milliseconds wide, having a peakamplitude of +6 dBm are generated internallyand fed to the output during calibration. The ninedifferent click-pulses range in frequency from 150Hz to 3600 Hz.

Because the click pulses are so short, theirrelatively high amplitude is not objectionable.Calibration is normally performed with the facilityunoccupied. The click pulses are so inoffensivethat calibration may be accomplished even withthe facility fully occupied.

With no program line audio input present, a set ofcalibration pulses is sent through the system foreach sense microphone. The delayed andreflected calibration pulses received by the sensemicrophones provide the CROWDCOMP with atotal system time/frequency profile.

The time/frequency profile received by eachmicrophone and the field programmed perform-ance parameters are stored in non-volatilememory. A “single configuration”, 18 pulsecalibration cycle lasts 59 seconds.


5 Seconds

4 Seconds

3 Seconds

2 Seconds

1 Seconds

Click 150

IMPORTANT NOTEANY change in the sound system following the CROWDCOMP willrequire a new calibration run. Equalization, gain or equipmentchanges downstream will change the time/frequency profile.

CALIBRATEEXPANSION RATIO - SENSE to OUTPUT

EXPANSION THRESHOLD

EXPANSION ATTACK


CALIBRATE

CONFIGURATIONSTATUS

+15.0dB

5 Seconds

4 Seconds

3 Seconds

2 Seconds

1 Second

Click 150

ReturnsFACILITY DELAY REFLECTOMETER

CONTINUEDON NEXT PAGE

5.7500 " 8 msec.

2.2500 "

+6 dBm2.18 v.

Typical 1200 HzClick Pulse

13020-0012-10.13

LynTec CROWDCOMP™


72 dBA return

at 380 msec.


EXPANSION THRESHOLD

EXPANSION ATTACK


CALIBRATE

CONFIGURATIONSTATUS

Click 150

Returns

Click 150

Click 300

Click 450

Click 600

.8.6 .7 .9 1.0 1.1 1.2

PRESS

DURINGCAL. TO HOLD & VIEW

RETURNS.4 .5DELAY

25 msec. / dot

FACILITY DELAY REFLECTOMETER6 dBperdot

146-

0048

-00

.3.20.1 sec.

96 dBA return

at 300 msec.


FACILITY DELAY REFLECTOMETERThe vacuum fluorescent display is used asa 50 column vertical bar-graph for the FDR(Facility Delay Reflectometer).

FDR functions:The FDR display shows the return results ofa calibration click pulse.

A click pulse is sent through the system.All of the responses at the click frequency ;direct returns, reverberation and reflectionsreceived by the sense mic. are displayed foran instant before the next click pulse.

Holding the FDR display for examination:

The display may be held for inspection bypressing the button.

While still holding down the button, press-ing the button displays the click frequencythat generated the display.

As soon as the button is released, cali-bration continues with the next higher fre-quency click pulse. Each frequency clickpulse usually will produce a different FDRdisplay, reflecting the time/frequency profileof the sound system in the facility.

Time displayed [horizontally]: 0 to 1.25 sec.in 25 msec. increments.

Amplitude displayed [vertically]: 72 to 108dBA in 6 dB increments.

The FDR is a valuable analytical tool forreading sense microphone performance,room parameters, and delays.

The display automatically dims during pro-gramming inactivity to extend life, returningto full brightness as soon as a control ischanged.CONTINUED

ON NEXT PAGE

020-0012-10.14

LynTec CROWDCOMP™


Temp Norm


Config. A

Config. B

Config. C

CONFIGURATION STATUSWhen you switch to the CONFIGURATIONSTATUS, a brief Low or Norm or Highmessage indicates the temperature condi-tions sent to the CROWDCOMP by the TS-2TEMPERATURE SENSOR. When nosensor is connected the message defaultsto Temp Norm . See pages 16-17 for details.

The present CONFIGURATION of thesystem is then displayed; A, B or C. Threedifferent sets of room parameters may bestored in the CROWDCOMP and called up withexternal switch contacts when the soundsystem configuration changes.

Example: An arena loudspeaker cluster ismoved to three different positions or con-figurations. Each of these positions have adifferent time/frequency profile.

A calibration series is run for both sensemicrophones in each of the 3 positions.

Grounding the appropriate configurationterminal on the rear of the unit tells theCROWDCOMP which configuration the soundsystem is in and which set of calibrationparameters to use.

If none or more than one are grounded theCROWDCOMP defaults to configuration A. Fortroubleshooting, green indicator LEDs lo-cated behind each barrier strip terminal, lightwhen the line is grounded.

An additional series-connected LED may belocated at the configuration switch for visualconfirmation of switch action.

CYA HINT

If you use the CROWDCOMP in a single con-figuration application it is wise to calibrate Band C also. If an accidental ground forceseither B or C configuration, you're covered.Otherwise a configuration change would bemet with a NO Cal message and no gainexpansion would be available.


EXPANSION THRESHOLD

EXPANSION ATTACK


CALIBRATE

CONFIGURATIONSTATUS

Temp Norm

Config. A

Config. B

Config. C

15020-0012-10.15

LynTec CROWDCOMP™


EXPANSIONSYSTEM

ACTIVE

BYPASS


EXPANSION THRESHOLD

EXPANSION ATTACK


CALIBRATE

INCREMENTDISPLAY

DECREMENTDISPLAY

ACTIVESENSE

MIC.12

dB GAIN EXPANSION1.5 3 6 9 12 15 18 21 24

+9.0dB

CONFIGURATIONSTATUS


Center Window Display

dB GAIN EXPANSION

The green LEDs above the alpha-numeric display showthe gain added by the CROWDCOMP in response to thechange in ambient noise level.

In this illustration the gain is expanded to the maximumallowed by the 9 dB MAXIMUM EXPANSION setting.

BYPASS switchThe panel mounted BYPASS switch pro-vides a complete hard-wire bypass of theCROWDCOMP. When the bypass switch isdepressed the internal bypass relay falls intoan un-energized state, connecting the lineinput to the output.

The green EXPANSION SYSTEM ACTIVEfront panel LED extinguishes in BYPASS.

AC power removal automatically bypassesthe CROWDCOMP by this mechanism.

Bypass may be accomplished remotely witha switch closure to ground. A red LEDlocated behind the BYPASS barrier stripterminal indicates when the line is grounded.

The two yellowLEDs indicate whichsense microphone isbeing used to pro-vide ambient sens-ing information.

The CROWDCOMP

uses the micro-phone having thehighest ambientlevel. When there islittle ambient noisepresent, the LEDsflash alternately at arandom rate.

When no calibrationdata is available,neither sense mic.indicator is lit.

020-0012-10.16

LynTec CROWDCOMP™


To CROWDCOMP Lo

terminal #9

To CROWDCOMP Hi

terminal #10

146-0051-02 Single ganghandy-boxoutline.(Box suppliedby others).

2.770"

4.520"

HI COMMON LO

To CROWDCOMP COMMONterminal #6

Plate is painted aluminum.

Face side may be painted tomatch surroundings.

020-0012-09.16.eps

TS-2 Temperature Sensor (Connect to LynTec CROWDCOMPensating Computer)

HI thermostat closes on temperature rise at 85°F ±5°. LO thermostat closes on temperature fall at 35°F ±5°.

NOTE: Due to the 15° hysteresis inherent in these thermostats, the HI thermostat may be initially closed if the ambient is in 70°-85° range. The plate may have been above 85° in shipment or installation but not cooled below 65°.

A little ice (not supplied) applied to the face of the cover between the thermostat mounting studs will reset it.

LynTec TS-2 Temperature SensorFunction: Provides temperature sensitive contact closures to CROWDCOMP for automatic speed-of-sound compensation in facilities where the sense microphones are located more than 460 feet from the main loudspeaker cluster.

The TS-2 consists of two thermostats mounted on a single gang blank cover plate.

The TS-2 should be mounted in an area shaded from direct sun exposure and in the ambient air representative of the temperature between the loudspeaker cluster and the sense microphones.

The TS-2 is supplied with 6-32 mounting screws and crimp type push-on connectors to attach wire to the thermostats.

Wiring requirements: One shielded pair, 22 ga., up to 3,000 ft.

See page 18 for combination mounting with sense microphone.

TS-2 Temperature Sensor (Connect to LynTec CROWDCOMPensating Computer)

HI thermostat closes on temperature rise at 85°F ±5°. LO thermostat closes on temperature fall at 35°F ±5°.NOTE: Due to the 15° hysteresis inherent in these thermostats, the HI thermostat may be initially closed if the ambient

is in 70°-85° range. The plate may have been above 85° in shipment or installation but not cooled below 65°.A little ice (not supplied) applied to the face of the cover between the thermostat mounting studs will reset it.

146-0051-02 HI COMMON LO

17020-0012-10.17

LynTec CROWDCOMP™


TS-2 Temperature Sensor

The CROWDCOMP™ is the only ambientnoise level control device available thatprovides compensation for variations in thespeed of sound due to temperature. (Delayincreases as temperature decreases)

Less than 460'..... TS-2 not needed

For short-throw applications where thesound source is less than 460 feet (140meters, 500 milliseconds) from the sensemicrophone this speed variation is not aconcern.

Beyond 460'..... TS-2 required

In long-throw applications beyond 500milliseconds, the change becomes signifi-cant and must be dealt with.

HI & LO inputs built-in C3

The CROWDCOMP™ has two temperatureinputs which advise the CrowdComp™ thatthe temperature is out of the normal 35° to85°F (2° to 29°C) range.

How TS-2 works

When the normal range is exceeded, oneof the TS-2 temperature sensor thermostatswill close. The contact closure advises theCROWDCOMP™ to factor the calibration datastored in non-volatile memory.

Many C3's may share one TS-2

Any number of CrowdComp's may shareone TS-2 sensor. Parallel all Terminal #9Lo's. Parallel all #10 Hi's. Connect to the Hi& Lo terminals of the TS-2.

Best temperature to calibrate

The most accurate method to compensatefor temperature is to calibrate in the normalrange as near to the center as is practical(60°F /16°C).

It may be impractical to cool the stadium to60° in August to meet the normal critera.

Calibration at either HI or LO extreme ispossible but not as accurate because thecalibration data must be factored twice atthe opposite temperature extreme.

It would be advisable to recalibrate thesystem near the normal temperature at afuture date. It's so simple, why not?

What is the TS-2 is telling theCROWDCOMP™ now ?

Switch to CONFIGURATION STATUS. Thedisplay will indicate a Temp LO, Temp Normor Temp HI message first and then theconfiguration status of the system.

The HI & LO leds behind the terminal stripon the rear of the unit will indicate immedi-ately when the thermostat contact closureoccurs.

FIRST CALIBRATION CAUTION

Before you run calibration at NORMALtemperature (below 85°F) make sure thatthe HI thermostat is not closed. (See hys-teresis explanation on TS-2 page)

020-0012-10.18

LynTec C

RO

WDC

OM

P™

18

4 inches

Front edge

3 inches

LynTec TS-2 Temperature Sensormounted on handy-box

One TS-2 may be used for any number of C3's, connect all #9 Lo's to LO and all #10 Hi's to HI.

Sense Microphone Mounting Detailscale: 50% of actual size.

for LynTec Crowd Compensating Computer

Mount close to the horizontal center of the supporting structure to provide full shading of the temperature sensor from

direct sun exposure.

020-0012-10.18.eps

1/2" conduit

It's important to keep face of microphone behind the face of the overhang to reduce wind blasts.

Keep this un-supported distance short to avoid mechanical resonances.

Temperature sensor only required when the sense microphone is more than 500 feet from the main loudspeaker cluster

LynTec RSM-2 Sense Microphone housed in

LynTec CEM-2 Conduit End Mount.

Supporting structure

Individually shielded pairs in conduit run to equipment rack.

Wire Requirements

One shielded pair for microphone, one shielded pair for temperature sensor.

22 gauge.

Microphone is supplied with 30 foot rubber cover cord.


19020-0012-10.19

LynTec CROWDCOMP™


DETAILED SPECIFICATIONSEXPANSION RATIO (SENSE to OUTPUT)

The ratio of sensed crowd noise to gain expansion.Programmable range: 0.5 to 1.5 dB gain expansionper dB of sensed change.

EXPANSION RATIO examples:

Example 1

A 1 dB = 0.8dB setting will produce an under-expanded gainchange of only 0.8 dB for a sensed ambient noise change of 1.0 dB.Under-expansion is useful when the headroom of the sound systemis limited and some control is desired over a wider range, or when a1 to 1 level change is perceived by the sound system operator asover-compensation. (Usually because he isn’t hearing full crowdnoise due to his isolated location [use sense microphone #1 outputfor ambient fill]).

Example 2

A 1 dB = 1.0 dB setting will accurately expand the gain in directproportion to the sensed crowd noise. A 6 dB change in sensedambient noise will produce a 6 dB gain expansion.

Example 3

A 1 dB = 1.2 dB setting will produce an over-expanded gain changeof 12 dB for a sensed ambient noise change of 10 dB. Over-expansion is useful when the ambient noise has an especially highmasking capability and an increase in the signal to noise ratio isdesired. (rarely used)

MAXIMUM EXPANSION

Front panel programmable from 1.5 to 24 dB in 1.5 dB steps.Useful to keep the gain expansion just below system clip point.

A MAX EXPAND terminal allows the sound system operator tofully expand the CROWDCOMP system gain by remote control toestablish field microphone levels. While talking the system, with theCROWDCOMP set at MAX EXPAND, the field microphone level isset just below feedback.

MAX EXPAND is implemented with the LynTec RD-1 RemoteDisplay or a momentary action switch convenient to the soundsystem operator.

CALIBRATE

To determine the time/frequency response of the complete soundsystem, including the room or environment that follows theCROWDCOMP, an automatic click-pulse calibration is performed.

Assuming the system is UNLOCKed, switching to the CALIBRATEposition initiates the automatic click-pulse calibration cycle after a 5second countdown.

Switching out of the CALIBRATE position during calibration stopsthe click pulses and aborts the calibration.


Click pulses 8 milliseconds wide, having a peak amplitude of +6 dBmare generated internally and fed to the output during calibration.The nine different click-pulses range in frequency from 150 Hz to3600 Hz, sounding like a kick-drum thump to a bird cheep.

CONTROLLED CHANNEL

One per CROWDCOMP unit.

GAIN EXPANSION characteristics:

Expansion range: 0 to 24 dB in 1.5 dB steps.

PROGRAM LINE INPUT (to be expanded) characteristics:

Maximum input level: 0 dBm (to guarantee full 24 dB expansion range).

Input Impedance, in ACTIVE mode: 600Ω, transformer balanced.

Input Impedance, in BYPASS mode: 600Ω, hard-wired by aninternal relay to the output.

PROGRAM LINE OUTPUT (to be expanded) characteristics:

Output Impedance: ≤30Ω, Electronically balanced. DO NOT ground.

Desired output load impedance: The output should be terminatedwith 600Ω to guarantee BYPASS level consistency.

Maximum output level: +24 dBm. (12.25v RMS)

CONTROLLED CHANNEL FREQUENCY RESPONSE

40 Hz to 20 kHz, ±1 dB.

TOTAL NOISE & DISTORTION

≤0.3% , 20 Hz to 30 kHz, at 24 dB expansion, 1 kHz, 0 dBm input.

FRONT PANEL CONTROLS

INPUT METER SELECTOR slide switch:

This 3 position slide switch selects the input to the INPUT LEVELSanalog bar graph meter. The top and bottom positions show theactivity of the SENSE MICROPHONES. The center positiondisplays the PROGRAM LINE INPUT level. The INPUT LEVELSmeter is a monitor indicator only and is independent of theCROWDCOMP digital gain expansion system.

PROGRAMMING SELECTOR SWITCH description:This rotary switch selects the field programmable parameters of theCROWDCOMP. The display reads the programmed value of eachposition.

The parameters are locked to prevent tampering but may bechanged with the INCREMENT or DECREMENT DISPLAY buttonsafter the UNLOCK button on the rear is pressed.

Any of the programmable parameters may be changed while thesystem is operating, updating within 50 milliseconds. Programmingis locked-out after two minutes of switch inactivity.

PROGRAMMING SELECTOR SWITCH functions:

EXPANSION THRESHOLD

Crowd noise level where gain expansion begins.Field programmable from 70 to 110 dBA (peak responding).

EXPANSION ATTACK

Total time required for gain to expand to theprogrammed MAXIMUM EXPANSION limit. (linear)Programmable range: 0.1 sec. to 99.9 sec.

EXPANSION DECAY

Total time required for gain to un-expand from theprogrammed MAXIMUM EXPANSION limit to zero. (linear)Programmable range: 0.1 sec. to 99.9 sec.

020-0012-10.20

LynTec CROWDCOMP™


DETAILED SPECIFICATIONS CONTINUED

Because the click pulses are so short, their relatively high amplitudeis not objectionable. Calibration is normally performed with thefacility unoccupied which is usually a worst-case situation from areflection/ reverberation standpoint. The click pulses are soinoffensive that calibration may be accomplished even with thefacility fully occupied.

With no program line audio input present, a set of calibration pulsesis sent through the system for each sense microphone.

The delayed and reflected calibration pulses received by the sensemicrophones provide the CROWDCOMP with a total system time/frequency profile.

The time/frequency profile received by each microphone and thefield programmed performance parameters are stored in non-volatilememory. A “single configuration” 18 pulse calibration cycle lasts 59seconds.

CONFIGURATION STATUS

This switch position reads the present CONFIGURATION of thesystem; A, B, or C. Three different sets of room parameters may bestored in the CROWDCOMP and called up with external switchcontacts when the sound system configuration changes.

Example: An arena loudspeaker cluster is moved to three differentpositions or configurations. Each of these positions have a differenttime/frequency profile.

A calibration series is run for both sense microphones in each of thethree positions.

Grounding the appropriate configuration terminal on the rear of theunit tells the CROWDCOMP which configuration the sound system is inand which set of calibration parameters to use. If none or more thanone are grounded the CROWDCOMP defaults to configuration A.

For troubleshooting, green indicator LEDs located behind eachbarrier strip terminal, light when the line is grounded. An additionalseries LED may also be located at the configuration switch for visualconfirmation of switch action.

BYPASS switch

The panel mounted BYPASS switch provides a complete hard-wirebypass of the CROWDCOMP. When the bypass switch is depressed,it latches mechanically, the internal bypass relay falls into an un-energized state, connecting the line input to the output.

The green EXPANSION SYSTEM ACTIVE front panel LEDextinguishes in BYPASS.

AC power removal automatically bypasses the CROWDCOMP by thismechanism. Bypass may be accomplished remotely with a switchclosure to ground. A red LED located behind the BYPASS barrierstrip terminal indicates when the line is grounded.

DISPLAYS

INPUT LEVELS horizontal bar graph:

The INPUT LEVELS LED bar graph display indicates the output ofeither sense microphone or the program line level input as selectedby the INPUT METER SELECTOR switch.

Range of SENSE MICROPHONES 1 & 2 display: 80 dBA to 107dBA, peak responding, using the LynTec sense microphone.

Range of PROGRAM LINE INPUT display: -17 dBm to +10 dBm.

The yellow LEDS advise caution on the PROGRAM LINE INPUT.

Exceeding a 0 dBm input limits the maximum expansion range.

Example: The maximum expansion of the CROWDCOMP is 24 dB.The maximum output level is +24 dBm. A +6 dBm input expanded24 dB would clip the output badly, but if MAXIMUM EXPANSIONwere set at +18 dB, the output would be OK

The red LED indicates where the line input will clip.

Center Window Display

ACTIVE SENSE MIC.

The two yellow LEDs indicate which sense microphone is beingused to provide ambient sensing information. The CROWDCOMP

uses the microphone having the highest ambient level. When thereis little ambient noise present, the LEDs flash alternately at arandom rate.When no calibration data is available, neither sense mic. indicatorwill light.

dB GAIN EXPANSION

The green LEDs above the alpha-numeric display show the gainadded by the CROWDCOMP in response to the change in ambientnoise level.

FACILITY DELAY REFLECTOMETER

The 10 character alpha-numeric vacuum fluorescent display isused as a program parameter display and as a vertical bar-graph forthe Facility Delay Reflectometer. (FDR)

The display automatically dims during programming inactivity toextend life, returning to full brightness as soon as a control ischanged.

FDR functions:

The FDR display shows the return results of a calibration click pulse.

A click pulse is sent through the system. All of the responses at theclick frequency; direct returns, reverberation, and reflectionsreceived by the sense mic. are displayed for an instant before thenext click pulse.

Holding the FDR display for examination:The display may be held for inspection by pressing the a button.While still holding down the a button, pressing the e buttondisplays the click frequency that generated the display.

As soon as the a button is released, calibration continues with thenext higher frequency click pulse. Each frequency click pulseusually will produce a different FDR display, reflecting the time/frequency profile of the sound system in the facility.

Time displayed [horizontally]: 0 to 1.25 sec. in 25 msec. increments.Amplitude displayed [vertically]: 72 to 108 dBA in 6 dB increments.

The FDR is a valuable analytical tool for reading sense microphoneperformance, room parameters, and delays.

21020-0012-10.21

LynTec CROWDCOMP™


Once the system is calibrated, preferably between 50°F and 70°F,thermostat action will command a calculated calibration changewhich is transparent to the user.

Wiring requirements: One 22 ga. shielded pair (shield common)5,000 ft. maximum run.

LO TEMP

Connected to 35° thermostat. (Part of TS-2 temperature sensor).A Green indicator LED located behind the barrier strip terminal,lights when the remote thermostat closes below 35°F.

HI TEMP

Connected to 85° thermostat. (Part of TS-2 temperature sensor).A Green indicator LED located behind the barrier strip terminal,lights when the remote thermostat closes above 85°F.

SENSE MICROPHONE INPUTS #1 and #2

Electronically balanced microphone inputs for LynTec RSM-2microphones. (E-V 649B)Input impedance: 150Ω. Sensitivity: 240 microvolts = 94 dBA.

SENSE MICROPHONE #1 OUTPUT

An auxiliary output from sense microphone #1 to supply sensedcrowd noise for sound operator’s room and elsewhere.

This output is single ended, low impedance, at line level.

Output: 0 dBm at 107 dBA. Clip: 125 dBA. Output impedance:≤50Ω.

REMOTE DISPLAY OUTPUTS

Seven terminals for driving the RD-1 Remote Display.

Wiring requirements: 5 active lines plus ground; 22 ga., 1,500 ft.maximum run. Use 5 conductor shielded or 3 shielded pairs withshields grounded.CABLE ROUTING CAUTION: A 500 Hz, 5v peak triangular wave isimpressed on 3 of the 5 lines. DO NOT route with microphone levelcables.

MICROPROCESSORSThe C3 uses two microprocessors; 10 MHz, 68000 & 11 mHz 8749.

MECHANICAL19.00" wide, 3.5" high, 10.0" max behind mounting surface.1.0" maximum frontal projection from mounting surface.Weight: 8 pounds.

ENVIRONMENTALTemperature: Operating 0°-140°F.Humidity: 0-90% Non-condensing.

POWER REQUIREMENTS85-135VAC, 50/60Hz, 25 watts maximum.5 ft, 3 wire line cord attached. NO power switch..

SAFETY APPROVALSThe power supply attached to the side of the C3 is UL & CSA listed.

The plug-in power supply supplied with the RD-1 is UL listed.

FCC DATAThe C3 meets the class A EMI/RFI requirements of FCC part 15.

DETAILED SPECIFICATIONS CONTINUED

REMOTE DISPLAYThe RD-1 Remote Display shows the sound system operator thedynamics of the CROWDCOMP’s GAIN EXPANSION and provides remotecontrol access to the MAXIMUM EXPAND and BYPASS functions.

The RD-1’s flat-pack design is field convertible to vertical orhorizontal mounting. Intended to mount on or near the soundsystem console, the RD-1 is fed data and power via a 7 ft., 8conductor modular telephone cable.

The modular cable is terminated by an modular interface, connectingto the remote cabling and a supplied small plug-in local power supply.

REAR PANEL CONTROLUNLOCK

The UNLOCK button unlocks the system so that programming maybe changed via the front panel rotary switch and the INCREMENTand DECREMENT DISPLAY buttons. The system automaticallylocks after two minutes of programming inactivity.

REAR PANEL CONNECTIONS

Input/Output terminations: 3-48 slotted head screw activated wireclamping terminal blocks at rear of unit.

AUDIO PROGRAM TO BE EXPANDED

600Ω BALANCED TRANSFORMER INPUT

The line input audio, typically from a mixer or line amplifier.

Input Impedance: 600Ω. Max. level: 0 dBm for full 24 dB expansion.

BALANCED OUTPUT

The expanded line output is typically connected to equalizer feeds.This output should be terminated in 600Ω and should NOT begrounded. To feed an unbalanced load: Connect from either outputterminal to chassis ground. Leave other output terminal UNGROUNDED.

The sensitivity of the system following the CROWDCOMP is important.The system should be set to clip with an input of +10 dBm. (2.45vRMS)

Any change in gain settings following the CROWDCOMP must beaccompanied by a new calibration run.The calibration pulses have a peak level of +6 dBm.

CONFIGURATION B & C control lines

Three nonvolatile memory locations are used to store calibrationdata. Reflections and return delays are generated by a click pulsecalibration run. Useful when cluster is moved.

The default memory is A.

Grounding either B or C CONFIGURATION terminal selects anothermemory location.

TEMPERATURE COMPENSATION

Temperature sensing and automatic compensation is required whenthe CROWDCOMP is operated in long-throw outdoor applicationshaving more than 500 milliseconds of delay between the sensemicrophones and the main loudspeaker cluster. (>460 ft.)

TS-2 temperature sensor contains a LO TEMP [35°F] and HI TEMP[85°F] thermostat mounted on a single position aluminum blankswitch cover. Mount in a shaded location to sense outside ambienttemperature. Wiring connections are crimped push-on terminals.

020-0012-10.22

LynTec CROWDCOMP™


Architect's and Engineer's Specifications

The Ambient Noise Compensating Computer shall control the gain expansion level of asound system in response to ambient noise. The device shall have an gain expansionrange of 0-24 dB in digitally controlled 1.5 dB steps. The device shall be field program-mable to begin expansion from a THRESHOLD sound pressure level of 70 dBA to 110 dBAin 1 dB steps. The device shall be programmable to provide attack and decay times of 0.1second to 99.9 seconds. Calibration shall be semiautomatic consisting of click pulses from150 Hz to 3600 Hz and shall be accomplished without any requirement for program audio.Calibration results shall be stored in nonvolatile memory. To prevent tampering, changesfrom all front panel controls except BYPASS shall be automatically locked out after 5 min-utes of programming inactivity. The device shall be housed in an 3.5" (2U) high all alumi-num, rack mountable housing, utilizing all stainless steel hardware, and shall fit a standard19" rack.The Ambient Noise Compensating Computer shall be the LynTec model C3.

A dynamic sense microphone shall be provided with a sensitivity of -61 dB (0 dB = 1 mW/10 dynes/cm2).The sense microphone shall be the LynTec RSM-2 mounted in a LynTec CEM-2 ConduitEnd Mount housing to mount on 1/2" conduit.

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LynTec CROWDCOMP™


Field Programming Setup Record

Location _______________________________________ Date _________________

Event _______________________________________________________________

CROWDCOMP unit # ______________________ SN:__________________ Software revision: _______________________

SYSTEM CONFIGURATION DETAILS

Configuration A (default) Configuration Description ___________________________________

EXPANSION THRESHOLD _________dBA EXPANSION ATTACK _______ Sec.

EXPANSION DECAY _______Sec. EXPANSION RATIO 1 dB =1 dB =1 dB =1 dB =1 dB = ______dB.

MAXIMUM EXPANSION __________dB. Cal OK ? [ ]

Final memory check: LOCK system by pressing UNLOCK button or waiting 2 minutes forauto-lock to occur.Switch to CALIBRATE. Does the display read Cal OK ? [ ] YES (you've done good!)

If you get a NO Cal , UNLOCK system and run a new calibration.Calibration data is stored as soon as system is LOCKED.

For multiple configuration systems: Check each configuration for a Cal OKmessage with switch set to CALIBRATE while changing configuration.

CROWDCOMP Input from: ______________ Output to: _________________________

Sense mic #1 location: ______________________________ Type ______________

Sense mic #2 location: ______________________________ Type ______________

Comments ___________________________________________________

Configuration B Configuration Description ____________________________________________

Comments ___________________________________________________

Configuration C Configuration Description ____________________________________________

020-0012-10.24

LynTec CROWDCOMP™


LIMITED WARRANTY

All LynTec products are warranted to be free from defects in workmanshipand materials for a period of 15 months from the original invoice date.Warranty status may be found on the serial number label which shows thewarranty expiration date. This warranty shall be limited to the repair, adjust-ment and/or replacement of defective parts.

LynTec will repair or replace defective LynTec products only at thefactory at 8401 Melrose Drive, Lenexa, KS 66214, U.S.A. 800-724-4047.All returns are to be prepaid. LynTec will pay return UPS surface freightcharges within the continental United States on warranty repairs. All cus-toms expenses and excess transportation charges will be borne by the cus-tomer.

LynTec will not be responsible for inconveniences or consequentialdamages occasioned by LynTec equipment, or by breach of anyexpress or implied warranty with respect thereto.

Implied warranties on this product shall be in effect only for the duration ofthe express warranty set forth above. After the warranty expiration dateshown on the serial number label, there shall be no warranties, express orimplied on the product.

This warranty becomes void if the product shows evidence of mishandling,tampering, battery or chemical corrosion, fire, water or lightning damage orother acts of nature, use contrary to the applicable instruction manual, ship-ping damage or repair performed by others.

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LynTec CROWDCOMP™


Remote Sensing Microphone

One RSM-2 microphone is supplied with the CrowdComp.

This microphone should be used to provide accurate dBA threshold settings.Mounting suggestions: Hang out of harm's way above the

average crowd (not the band).or

Use CEM-2 Conduit End Mount shown below(See page 18 for outdoor mounting suggestions)

orGrommet mount in a box with face of microphone exposed.

Be sure that the mounting structure isn't a source of vibration that might be transmittedmechanically to the microphone.

RSM-2 Remote Sensing Microphone(E-V 649B see page 26 for specifications)

mounted in

CEM-2 Conduit End Mount

US649BDYNAMIC LAVALIERMICROPHONE

DescriptionThe US649B lavalier microphone is a small, lightweight, dynamic microphone.

Omnidirectional Microphone AdvantagesThe US649B's omnidirectional polar pattern brings significant advantages in certain situations. The omnidirectional character of the US649B will result in a smoother frequency response than you would find in a similarly priced unidirectional.The US649B is also significantly less susceptible to p-popping and mechanical shock, and generally more rugged and roadworthy than its unidirectional counterpart.

Specifications

Element: Dynamic

Frequency Response: 80 to 10,000 Hz

Polar Pattern: Omnidirectional

Impedance: 150 ohms (Low-Z)

Output Level: -61 dB (0 dB = 1 mW/10 dynes/cm2)

Finish: Nonreflecting blue/black

Cable: 9.1 m (30 ft) two-conductor, shielded, black synthetic rubber-jacketed cable

Dimensions

Length: 57.2 mm (2.25 in.)

Maximum Diameter: 19.0 mm (0.75 in.)

Net Weight: 31.0 g (1.1 oz) less cable and neck cord assembly

Service and Repair Address for this product:Telex Communications, 8601 E. Cornhusker Hwy, Lincoln, NE 68505

Wiring Diagram

SHIELD

BLUE

REDRED

GREEN

BLACKPIN 1

PIN 3

PIN 2

POSITIVE VOLTAGE ON RED CABLE LEADWITH POSITIVE PRESSURE ON DIAPHRAGM

HEAD

MARKED HEADTERMINAL

Frequency Response

Polar Response at 1,000 Hz

5 dB PER DIVISION

150°

180°

120°

90°

60°

30°

0°

210°

240°

270°

300°

330°

1kHz

57.2 mm(2.25 in.)

19 mm(0.75 in.)

FREQUENCY IN HERTZ

RE

SP

ON

SE

IN d

B5

dB

20,00010,0005,0002,0001,000500200100503020

MO

DE

L 649B


020-0012-10b2 C3 Manual - · PDF fileRSM-2 Remote Sense Microphone ... Analog input meter...

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