tm Concert Series EQUALIZER/LEVEL MATCHER · 2014-09-17 · EQUALIZER/LEVEL MATCHER 22410 70th Ave....

EQUALIZER/LEVEL MATCHER

22410 70th Ave. W., Mountlake Terrace, WA 98043Phone 425-775-8461 • Fax 425-778-3166

www.audiocontrol.com

®making good stereo sound better®

®

OWNER’S MANUALOWNER’S MANUALOWNER’S MANUALOWNER’S MANUALOWNER’S MANUAL

tm

Concert Series

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Concert Series Owner’s Manual

Quick Installation InfoQuick Installation InfoQuick Installation InfoQuick Installation InfoQuick Installation InfoRefer to Figures 4, 5, and 6 (on pages 9, 10, and11) when installing the EQL Equalizer.

The unit is shipped from our factory withthe Programmable Frequency Match filtermodule set at 30 Hz (see page 18 to changethis).

For information on other system applica-tions or related topics, please read further.

TTTTTable of Contentsable of Contentsable of Contentsable of Contentsable of ContentsIntroduction ....................................1

Description ......................................4

Installation ......................................8

Upgrading A Factory(OEM) System ................................16

Making Your Own ProgrammableFrequency Match Modules ............18

Troubleshooting ............................20

Warranty .......................................22

Specifications ................................24

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We design, test, and build each EQL Equalizerright here in the misty rain forests1 of thePacific Northwest. When you look inside therugged two-piece steel chassis, you’ll find weuse only premium electronic parts and gold-plated RCA jacks.

It all adds up to a product that will provideyou with many years of listening enjoymentand will literally outlast your vehicle.

Congratulations!Congratulations!Congratulations!Congratulations!Congratulations!You have purchased one of the most excitingand innovative audio products available foryour car stereo system – the AudioControlEQL Equalizer/Level Matcher.

The EQL can make any system sound better.Even if you have followed the true path ofenlightenment and are having your new EQLprofessionally installed, it doesn’t hurt toread this manual. There’s nothing but rerunson the tube anyway!

The EQL carries on a great tradition startedback in 1985, when we introduced the origi-nal EQL. Since then, AudioControl has goneon to win numerous awards and collectmany glowing reviews for its innovativeautosound products. We have learned a greatdeal about cars, stereos, and acoustics overthe years. All of this has been poured into thenew EQL to give you the tools to make yourcar stereo the envy of all your pals.

1

Introduction

1At last count, we see the sun only 129days each year, so we use the abundantindoor hours doing what we do best –improving and inventing audioproducts – besides, it keeps us fromgoing insane.

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ä Dual Bandwidth Equalizer – 13 bands

The dual bandwidth design of the EQLconcentrates more control in the lowerbass frequencies where the interior of anautomobile causes problems. The higherfrequency controls are spaced on octavecenters to give you complete control upto 16,000 Hz. No simple dash-mountequalizer gives you this kind of flexibility.

ä Level Matching

True standards in car stereo are hard tofind. Every manufacturer has a slightlydifferent interpretation of things. Theinput and output level controls on theEQL bring everything together. Now anyhead unit can be connected to any ampli-fier and the will system sound great.

ä Balanced Input

The EQL takes noise rejection a stepfurther than the average by incorporatingbalanced differential input circuitry. Bylooking at the output from your sourceunit in a different way the EQL can rejectup to 60 dB of radiated noise.

ä Programmable Frequency Match Filter

Our exclusive Programmable FrequencyMatch (PFM) filter system brings out thebest in any system. A modular program-mable low-cut frequency filter allows thesystem installer to easily customize thebass roll-off to match any speaker design.Unruly subwoofer boxes can finally bebrought under control.

2

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ä High Level Inputs

The EQL is so flexible that you don’t evenneed to have pre-amp outputs on yourdeck to enjoy the benefits of total control.Speaker level signals can be run directlyinto the EQL, equalized and level-matched to use any aftermarket amplifieror crossover with your system. There areno limits.

IMPORTIMPORTIMPORTIMPORTIMPORTANTANTANTANTANTFor maximum product performance, noth-ing is better than a professional system instal-lation. Your AudioControl dealer has thetraining and tools to take care of the jobquickly and without the anxiety of drillingholes in your car. If you are just a dyed-in-the-wool do-it-yourselfer, then this manualshould provide all the info you need tosuccessfully make music with the EQL.

The Most ImportantThe Most ImportantThe Most ImportantThe Most ImportantThe Most ImportantInstruction Of AllInstruction Of AllInstruction Of AllInstruction Of AllInstruction Of AllFILL OUT AND SEND IN THE WARRANTYCARD! Also, save the invoice or sales slip asproof of purchase. These actions will protectyour investment and allow us to better helpyou with any service-related questions.

3

Introduction


Figure 1.Top panellayout for EQLEqualizer/Level Matcher.

4

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DescriptionDescriptionDescriptionDescriptionDescriptionWe’ve created the EQL Equalizer/LevelMatcher to make any system sound better.This Performance Match™ Component2

features straightforward connections andeasy-to-adjust equalizer and level controls. Tolearn more, read on.

Equalizer and Input/Output LevelEqualizer and Input/Output LevelEqualizer and Input/Output LevelEqualizer and Input/Output LevelEqualizer and Input/Output LevelControls and IndicatorsControls and IndicatorsControls and IndicatorsControls and IndicatorsControls and IndicatorsThe top panel contains all equalizer controls,input/output controls, and system indicators.The equalizer controls are grouped by channelsin ascending frequencies from left to right, asshown in Figure 1 on the previous page.Each equalizer control provides 12 dB of boostor cut for each channel. The Input Gain con-trols allow you to adjust the Left or Right Inputgain over a range of ± 18 dB. Output attenuatorsprovide up to 30 dB of gain trim. The top panel2Our line of Performance Match Components takes the guess-work out of creating the best-sounding system by “matching”autosound components to your vehicle. For more information,see page 21.

also includes several indicators to confirmpower and help set output levels.ä HALF OCTAVE BASS EQUALIZER – six

half-octave bass equalizer controls foreach channel with frequency centers at31.5, 45, 63, 90, 125, and 180 Hz.

ä OCTAVE EQUALIZER – seven full octaveequalizer controls with frequency centers at250 and 500 Hz; and 1, 2, 4, 8, and 16 kHz.

ä INPUT GAIN – variable gain controls toadjust Left and Right Input levels.

ä OUTPUT LEVEL CONTROLS – outputattenuators for Left and Right Outputs.

ä INPUT MAXIMIZED – indicator for set-ting the proper input gain. When thislight flickers you have juust the rightamount of input gain.

ä 2 VOLT OUTPUT – indicator for monitor-ing output level to detect and set a 2 voltlevel.

ä POWER – indicator confirms power isreaching the EQL.

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5

Description


Connections and Equalizer BypassConnections and Equalizer BypassConnections and Equalizer BypassConnections and Equalizer BypassConnections and Equalizer BypassThe front panel contains power and input/output connections, as well as an equalizerbypass button, as shown in Figure 2 (above.)

ä HIGH LEVEL INPUT – Our handy plug forconnection of speaker outputs from adeck or factory stereo.

ä EQUALIZE IN/OUT – Press in to engagethe equalizer settings on your EQL.

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Figure 2. Front panel layout for EQLEqualizer/Level Matcher.

6

ä LINE LEVEL INPUT – RCA jacks for con-nection of low-level stereo signals from ahead unit.

ä OUTPUT – RCA jacks for connection ofEQL outputs to the inputs of an amplifier.

ä REMOTE/+12/GROUND - Another handyplug for power connections of yourRemote Turn-On lead, +12 Volts, andPower Ground.

High Level

Input

L R

+ – – +

Equalize

In

Out

Line Level

Input

L R

Output

L RRemote Ground

+12

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Programmable FProgrammable FProgrammable FProgrammable FProgrammable Frequency Matchrequency Matchrequency Matchrequency Matchrequency MatchFilter Module and Ground IsolationFilter Module and Ground IsolationFilter Module and Ground IsolationFilter Module and Ground IsolationFilter Module and Ground IsolationSelector (Inside)Selector (Inside)Selector (Inside)Selector (Inside)Selector (Inside)The Programmable Frequency Match filtermodule, as well as the Ground IsolationSelector, are internal and can be accessed byremoving the four top screws and lifting thetop panel off the base, as shown in Figure 3(also see Figure 8 on page 19). Be sure to turnoff the power before you open the EQL.

We ship each EQL with the ProgrammableFrequency Match filter set at 33 Hz. Refer topage 18 for information on how to createyour own custom PFM module.

250 Hz

60

-6 +12

-1260

-6 +12

-12

500 Hz

60

-6 +12

-1260

-6 +12

-12

1 KHz

60

-6 +12

-1260

-6 +12

-12

2 KHz

60

-6 +12

-1260

-6 +12

-12

4 KHz

60

-6 +12

-1260

-6 +12

-12

8 KHz

60

-6 +12

-1260

-6 +12

-12

16 KHz

60

-6 +12

-1260

-6 +12

-12

Left

Right

31.5 Hz

60

-6 +12

-1260

-6 +12

-12

45 Hz

60

-6 +12

-1260

-6 +12

-12

63 Hz

60

-6 +12

-1260

-6 +12

-12

90 Hz

60

-6 +12

-1260

-6 +12

-12

125 Hz

60

-6 +12

-1260

-6 +12

-12

180 Hz

60

-6 +12

-1260

-6 +12

-12

Left

Right

Half Octa

ve Equalizer

Left

Right

Made in

America

Dual-Bandwidth Graphic Equalizer,

Programmable Frequency Match Filte

r,

Transform

er Isolated DC/DC Power Supply

22410 70th Avenue West

Mountlake Terrace, W

A 98043

206-775-8461Serial N

umber

Output Status

Overload

2 Volt Optim

um

Power

0

-6

-12

6 12

-18

+18

0

-6

-12

6 12

-18

+18

Output Level

Input Gain

PFM Module

Located Inside

Line Level

Input

L

R

Output

L

R

High Level

Input

L R

+

+-

-

OutIn

Equalize

Remote Ground

+12 APerform

ance Matc

h

C

omponent

Series II

0-

0-

Octave Eq

ualizer

Figure 3. Removing the four top screws and liftingthe top panel provides access to the ProgrammableFrequency Match filter module and GroundIsolation Selector.

7

Description

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InstallationInstallationInstallationInstallationInstallationWe strongly suggest you have the EQL pro-fessionally installed, but if you are doing itsolo this section lists the procedures you’llneed to install the EQL in your vehicle.Before you begin we suggest you read thenext few sections to plan the type of systemyou want.

System ApplicationsSystem ApplicationsSystem ApplicationsSystem ApplicationsSystem ApplicationsThe EQL Equalizer/Level Matcher is quiteversatile. Use it to put together a simplesingle-amplifier system, as shown in Figure 4on page 9. Or better yet, add a couple of ourother fine components, and you are on yourway to building a great 2-way or 3-waysystem, as shown in Figures 5 and 6 (on pages10 and 11).

Installation PrecautionsInstallation PrecautionsInstallation PrecautionsInstallation PrecautionsInstallation Precautionsä Do not mount the EQL Equalizer/Level

Matcher where it will be exposed to outsideelements or extreme temperatures. Avoidareas that are subject to extreme road vibra-tion or shock. The front bumper is definitelyout-of-bounds.

ä Select an installation site that provides shortcable runs for minimum pick-up of enginenoise and RFI (radio frequency interference).Keep RCA cables together, away fromspeaker wires or power cables.

ä At the proposed installation site, make surethe holes you plan to drill will not hit thefuel tank, fuel lines, brake lines (underchassis), or go through any electrical wiring.

ä Use high-quality, fully-shielded RCA cables.

ä Plan on a single-point grounding schemethat is common to grounded parts of thesystem. Use no less than 16-gauge strandedcopper wire for the ground connection.

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8

Figure 4. Wiring diagram for EQL Series II in asingle amplifier system.

Installation

9


Figure 5. this wiring diagram shows a 3-way systemthat uses an EQL with an ESP-2 Spatial RestorationProcessor and a 4XS used as a 3-way Crossover.

10

Figure 6. Wiring diagram shows an EQL with anAudioControl System90 Powered Signal Processorin Bi-Amp Mode.

Installation

11

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WARNINGWARNINGWARNINGWARNINGWARNINGBefore installation, turn off thepower to the head unit or radio anddisconnect the negative (-) lead ofyour vehicle’s battery.

Mounting the EQLMounting the EQLMounting the EQLMounting the EQLMounting the EQL1. Select a permanent mounting site for the

EQL. Make sure you observe the Installa-tion Precautions listed on page 8.

2. Position the unit and use either a felt-tippen or spring-loaded center punch tool tomark locations for the four mountingholes.

3. Drill a small pilot hole at each markedlocation.

4. Secure the EQL with self-tapping screws.

Connecting the EQLConnecting the EQLConnecting the EQLConnecting the EQLConnecting the EQL1. Connect +12 Vdc and Ground from the

vehicle’s electrical system to the corre-sponding +12 and GROUND terminals onthe EQL. Also connect the Remote turn-on signal from the head unit to the RE-MOTE terminal.

2. Connect a set of RCA cables from thehead unit Left and Right outputs to theLINE LEVEL INPUT (LEFT and RIGHT) onthe EQL.

DO NOT CONNECT OUTPUTS ATTHIS TIME!

NOTE: For high-level signals, splice speakercable onto the radio’s speaker wires and connectto the HIGH LEVEL INPUT (Left and Right).

3. On the EQL, set all equalizer controls tothe flat (i.e.,“0”) position. Set the INPUTGAIN controls for minimum gain

12

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(i.e.,“-18”). Set all OUTPUT LEVEL controlsfor maximum attenuation (i.e.,“- ∞”). Pressthe EQUALIZE button IN.

4. Reconnect the vehicle’s negative (-) bat-tery lead and proceed to the next section.

AAAAAdjusting the EQLdjusting the EQLdjusting the EQLdjusting the EQLdjusting the EQL1. Turn on the head unit or radio. On the

EQL, you should see the (red) POWERindicator illuminate. If not, check thepower connections, and try again. A testlight or digital multi-meter works greatfor this.

2. Play a favorite tape or CD with consistentmusic and turn up the volume control onthe head unit or radio to maximum level.

NOTE: Since the outputs are not connected, youwon’t hear any sound at this point.

3. Adjust the INPUT GAIN control until theyellow INPUT MAXIMIZED starts toflicker. Now back the control off until theLED goes out.

4. Next, start the trackoverso that you arereferencing the same musical informa-tion as in step 3. Adjust the OUTPUTLEVEL until the 2 Volt Output light isflickering steadily. If you find that youhave turned the OUTPUT LEVEL all theway up without the 2 Volt Output lightcoming on, you may leave this control at“0” (or its fully clockwise position.)

5. Turn down the volume and power off thehead unit or radio.

6. Connect the EQL outputs according toyour system plan.

Installation

13

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are in a real hurry, you can set the equal-izer by ear.

10. Listen to the vocals and instruments, andtrying cutting the frequencies in the mid-bass (90 to 250 Hz) and mid-range (2 to 4kHz) spectrum. The mid-bass response isusually a problem area due to standingwaves caused by sound resonating in thepassenger compartment. The mid-rangefrequencies are most sensitive to the earand usually need to be brought down abit.

11. Continue listening and try boosting thelow bass frequencies in the 31.5 to 63 Hzarea. Usually this area needs help due todesign limitations of smaller woofers andloss of bass in cassettes.

AAAAAdjusting the EQL (cont’d)djusting the EQL (cont’d)djusting the EQL (cont’d)djusting the EQL (cont’d)djusting the EQL (cont’d)NOTE: Consult the amplifier owner’s manualfor information on setting its input sensitivity.If adjustable, set each amplifier to accept asignal between 1.0 and 2.0 volts (1000 and 2000mV). This may be a minimum setting on youramp. Don’t worry, the EQL can still drive it tofull volume. If your Amp cannot accept 2V youmay need to turn the output level down a bit.

7. Play the same tape or CD (preferably onecontaining a variety of acoustic instru-ments).

8. With the deck’s volume set to a normal tohalf-way listening position (i.e., aboutone-third on), adjust the OUTPUT LEVELcontrols, if necessary, to get the systemplaying at a comfortable level.

9. A third-octave real time audio analyzer isthe ultimate tool for getting the bestsound quality from your new EQL. If you

14

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Installation

NOTE: If the (yellow) OVERLOAD indicatorcomes on, something is boosted too much.Either bring down the suspect frequency controlor adjust the INPUT GAIN controls to reducethe overall gain.

12. As a final check, press the EQUALIZEswitch OUT and IN to compare the soundwith and without equalization. Trydifferent program sources and make anyfinal adjustments.

Using a Real Time Audio Analyzer (RTUsing a Real Time Audio Analyzer (RTUsing a Real Time Audio Analyzer (RTUsing a Real Time Audio Analyzer (RTUsing a Real Time Audio Analyzer (RTA)A)A)A)A)For a really well-balanced system, we highlyrecommend using a Real Time Analyzer (likethe AudioControl SA-3055) to adjust yourvehicle’s sound system. This tool is especiallyhelpful in performing the initial adjustmentsfor multi-amplifier installations.

Balancing a system “by ear” should be per-formed as fine-tuning after using a Real Time

Analyzer, since our ears adapt very quickly toany new frequency adjustments.

In fact, if you listen to a badly-adjusted sys-tem long enough, it will actually start sound-ing pretty good. Only later, when your hear-ing “refreshes” and your buddies come toaudition your new system, will you realizehow far off the mark Def Leppard really is!

Now. . . do yourself a big favor and ask anauthorized AudioControl dealer about thisprofessional sound-balancing option.

AudioControl SA-3055 Third- Octave Real TimeAudio Analyzer 15

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Upgrading A FUpgrading A FUpgrading A FUpgrading A FUpgrading A Factoryactoryactoryactoryactory(OEM) System(OEM) System(OEM) System(OEM) System(OEM) SystemReplacing a factory (OEM3) radio gets hardereach model year. Besides the non-standardsizes, new models even feature volume andtuning controls imbedded right in the steer-ing wheel! It’s great for convenience, buttough on the knuckles. It seems the boys inDetroit and Japan want to make sure youdon’t throw out the original radio and re-place it with some better model.In all fairness, today’s crop of factory radios isbetter. So rather than lose those nice steeringwheel volume controls, we’ve come up witha way of improving your sound system byusing the High Level Inputs on the EQL andthe speaker leads from your factory radio, asshown in Figure 7 on page 17.3OEM stands for Original Equipment Manufacturer, which usedto mean that a car manufacturer actually built and installedeach radio. Nowadays, a factory radio is made by an aftermarketcompany for installation by the car manufacturer.

It’s as simple as moving the wires from thespeakers to the EQL. Don’t worry, the EQL isdesigned to effortlessly handle the highersignal levels coming from the factory radio,without a trace of overload or added distor-tion.

16

17

Upgrading Factory Systems

Figure 7. Wiring diagram showsa factory (OEM) systemupgraded with the EQL and anAudioControl System90Powered Signal Processor tocreate a superlative 2-waysystem.

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7200 Frequency (in Hz)

EXAMPLE – For a 25 Hz filter, theformula yields a resistor with a value of

7200 25

NOTE: Use only resistors having a tolerance offive percent or better (i.e., 5%, 2%, etc.).

WARNINGWARNINGWARNINGWARNINGWARNINGTURN OFF THE SYSTEM BEFORE CHANG-ING THE MODULE, OR ELSE SOMETHINGIN YOUR SYSTEM WILL BE DAMAGED!

CAUTION: The Programmable FrequencyMatch Module must always be installed, evenif you are not using the filter. Failure to do somay damage the EQL.

Making YMaking YMaking YMaking YMaking Your Ownour Ownour Ownour Ownour OwnProgrammable FProgrammable FProgrammable FProgrammable FProgrammable FrequencyrequencyrequencyrequencyrequencyMatch ModulesMatch ModulesMatch ModulesMatch ModulesMatch ModulesThe EQL comes with an 18 dB per octaveProgrammable Frequency Match low-cut filtermodule already set to 33 Hz. This will act as asubsonic filter, protecting your woofers. If youhave large woofers (i.e., 12" or 15"), you maywant a lower frequency module. With smallerwoofers (i.e., 6" or 8"), use a higher frequencyProgrammable Frequency Match module.

Additional modules with pre-set frequenciesare available from an authorized AudioControldealer, or you can create a custom low cut filtermodule by using the following formula4:4For more details, read our — (HEY! Not another #%*&% plugdisguised as a #%*&% footnote!) — ok, OK, OKAY! — We’ll make adeal with you. Send us ten bucks, and we’ll send you the wholeset of Tech Papers and Tech Notes (which includes our Techni-cal Note #1005 Crossovers Modules). And you won’t have toread another tiny footnote — unless you want to.

= Resistor Value (in kohms)

= 288 kohms

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Figure 8. Removing the top panel lets you access theinternal Programmable Frequency Match moduleand Bypass Switch.

Doing The DeedDoing The DeedDoing The DeedDoing The DeedDoing The Deed1. Turn the system power off.

2. Remove the top panel and locate theProgrammable Frequency Match module,as shown in Figure 8.

3. Change the module.

4. Replace the top panel and tighten thescrews.

5. Turn the system power on.

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Making Modules

INNARDS (top view)

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ProblemProblemProblemProblemProblem TTTTTry Thisry Thisry Thisry Thisry ThisWhine or Buzz Move the Ground Selector

switch to another position. See page 19.

Headache Turn down the volume.

TTTTTroubleshootingroubleshootingroubleshootingroubleshootingroubleshootingProblemProblemProblemProblemProblem TTTTTry Thisry Thisry Thisry Thisry ThisNo Sound Make certain the PFM module

is installed. See page 19.

Are the input and outputlevel controls adjusted? Seepage 13.

No Power Check the +12 volt, ground, andremote turn-on leads.

Hiss Turn down the input levelson the amplifier. Use theoutput controls on the EQLto bring the volume back up.See page 13.

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Unabashed Plug!Unabashed Plug!Unabashed Plug!Unabashed Plug!Unabashed Plug!In addition to the EQL, we manufacture aunique line of high-quality PerformanceMatch Components, all designed to worktogether to give you the best-soundingsystem, regardless of the type of vehicle youown. These components have won so manyawards, the walls in our lobby are SAGGING!

The Master Volume Control (MVC) is theultimate in high Signal-to-Noise design. Withyour source unit all the way up it is at itsmaximum S/N ratio, not to mention ap-proaching its highest voltage out. Pipe thishot clean signal down the line and control itwith theMVC justprior to thesignal’sentry intothe amps.

Bragging!

The Epicenter™ is our patented bass restora-tion solution that will dramatically addimpact ordepth to yoursound system,so you canreally feel thebass.

The ESP-2™restoresspaciousness to recordings to fill your vehiclewith concert hall sound.

So visit an authorized AudioControl dealerand ask a salesperson about them.AudioControl specializes in making goodstereo sound better™!

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WWWWWarrantyarrantyarrantyarrantyarrantyPeople are scared of warranties. Lots of fineprint. Lots of noncooperation. Months ofwaiting around. Well, don’t be scared of thiswarranty. It’s designed to make you raveabout us to your friends. It’s a warranty thatlooks out for you and helps you resist thetemptation to have your friend “who’s goodwith electronics” try to repair your Audio-Control EQL. So go ahead and read thiswarranty, then enjoy your new componentfor a few days before sending in the warrantycard and comments.“Conditional” doesn’t mean anything omi-nous. The Federal Trade Commission tells allmanufacturers to use the term to indicatethat certain conditions have to be met beforethey’ll honor the warranty. If you honorthese conditions, we will warrant all materi-als and workmanship on your EQL for FiveYears from the date you bought it, if installed

by an authorized AudioControl dealer, andwill fix or replace it, at our option, duringthat time. For you do-it-yourselfers we willwarrant your EQL for One year.Here are the conditions that make this war-ranty conditional:1. You have to fill out the warranty card

and send it to us within 15 days after youpurchase your EQL.

2. You must keep your sales slip or receipt soyou have proof when and from whomyou bought your EQL. We’re not the onlycompany to require this, so it’s a goodhabit to be in with any stereo purchase.

3. Your EQL has to have been originallypurchased from an authorized AudioCon-trol dealer. You do not have to be theoriginal owner to take advantage of thewarranty, but the date of purchase is stillimportant, so be sure to get a copy of thesales slip from the original owner.

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4. You cannot let anybody who isn’t: (a) theAudioControl Factory; (b) an authorizedservice center; or (c) someone authorizedin writing by AudioControl service yourEQL. If anyone other than (a), (b) or (c)messes with your EQL Series II, that voidsthe warranty.

5. The warranty is also void if the serialnumber has been altered or removed, or ifthe AudioControl EQL is used improp-erly. Now, that sounds like a big loophole,but here is all we mean by it.Unwarranted abuse is: (a) physical damage(our mobile products are not meant to beused as jack stands for your car); (b) im-proper connection (we have done thebest we can to protect the inputs, how-ever, 120 volts into the jacks can fry theinnards of the poor beasty); (c) sadisticthings.This is the best mobile product we knowhow to manufacture, but if you use it for

the front bumper of your Baja bug andget it full of water and dirt, things will gowrong.

Assuming you conform to numbers 1through 5, and it isn’t all that hard to do, weget the option of deciding whether to fixyour old unit or replace it with a new one.

Legalese SectionLegalese SectionLegalese SectionLegalese SectionLegalese SectionThis is the only warranty given by AudioCon-trol. This warranty gives you specific legalrights which vary from state to state.Promises of how well your EQL will work arenot implied by this warranty. Other than whatwe’ve covered in this warranty, we have noobligation, express or implied. Also, we will notbe obligated for direct or indirect consequen-tial damage to your system caused by hookingup the AudioControl EQL.Failure to send in a properly-completedwarranty card negates any service claims.

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And Now, A Word From Our Lawyers


Block Diagram

Figure 9. Block diagram of the EQL Equalizer/LevelMatcher.

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SpecificationsAll specifications are measured at 14.4 Vdc (standard automotivevoltage).

Frequency Response: 10 Hz to 20 kHz ± 1 dB

Total Harmonic Distortion (THD): 0.005%

Signal to Noise Ratio (SNR): 110 dB at full output

Maximum Output Level: 7.5 volts rms

Input Gain: ± 18 dB

PFM Filter Slope: 18 dB per octave

PFM Frequency: Programmable 15 to 100 HzFactory Shipped @ 33Hz

Power Supply: Variable isolation. Trans-former switching supply

Fuse Rating: 2 amps

Size: 1.25" h x 8.9" w x 6.9" d

Weight: 3 lbs

Balanced Input Yes

Ground Isolation Jumpers Yes

Country of origin: USA

© AudioControl 1998. AudioControl is a division ofElectronic Engineering and Manufacturing, Inc.All rights are reserved.

AudioControl, AudioControl Industrial, PerformanceMatch, Making Good Stereo Sound Better, EQX, ESP-2,MVC, ESP-3, System90, and The Epicenter are all trademarksof Electronic Engineering and Manufacturing, Inc.

This manual is written, designed, printed, folded and stuffedinto a box in the U.S.A. on yet another rainy day.

Uh-oh! The roof is starting to leak. . .

Specifications are subject to change - just like ourPacific Northwet weather.

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Specifications

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Doodle Here!Doodle Here!Doodle Here!Doodle Here!Doodle Here!

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tm Concert Series EQUALIZER/LEVEL MATCHER · 2014-09-17 · EQUALIZER/LEVEL MATCHER 22410 70th Ave....

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Transcript of tm Concert Series EQUALIZER/LEVEL MATCHER · 2014-09-17 · EQUALIZER/LEVEL MATCHER 22410 70th Ave....