Canisius College Sport Hall Architectural Acoustics
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Transcript of Canisius College Sport Hall Architectural Acoustics
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ARCHITECTURAL ACOUSTIC & AUDIO DESIGN CONSULTATION
Canisius College Sport HallJakarta
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Outline• Pendahuluan• Teori• Pengukuran• Hipotesa dan Solusi Design• Kesimpulan
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PENDAHULUAN
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Fungsi RuangFUNGSI KEGIATAN AUDIO LEVEL REKOMENDASI
RT-60OCCUPANT (ORANG)
Latihan Olahraga Basket, Bulu Tangkis, Senam
NO-AUDIO <2 s 10 - 50
Latihan Kesenian Paduan suara, alat musik, drama, dll
75-95 dBA <1,5 s 10 - 50
Pertandingan Olahraga
Basket, Bulu Tangkis 85-95 dBA <2 s 50 - 200
Pertunjukan Seni Paduan suara, Band, Alat musik tiup
90-105 dBA <1,5 s 50 - 200
Acara Formal Wisuda, misa, briefing, seminar
85-95 dBA < 1,5 s 200 - 600
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Latar Belakang
• Kejelasan suara pada saat berpidato dan bermusik dirasakan kurang baik
• Sound engineer kesulitan untuk mengontrol level suara dan sinkronisasi musik pada saat acara berlangsung
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Sasaran• Reverberation Time 60 menjadi 1.5 detik pada saat ruangan kosong• Distribusi Sound Pressure Level (SPL) nilai 95 dBA dengan toleransi
maksimal minus 5 dB• Speech Transmission Index 0.45 pada seluruh area audiens dan panggung• Memindahkan control room pada spot yang dapat memantau
kelangsungan kegiatan secara langsung. Control room sebaiknya mendapatkan nilai SPL dan reverberation time yang sama dengan area tempat audience berada.
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Speech Transmission Index (STI)
• STI adalah perhitungan fisika tentang kualitas penyampaian suara pidato dengan nilai indeks 0 sampai 1.
Speech Transmission Index berdasarkan IEC 60268-16:2003.
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Reverberation Time
* R. B. Newman, “Acoustics” in J. H. Callender (ed.), Time - Saver Standards for Architectural Design Data, McGraw-Hill, New York
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Reverberation Time
* ASA (Acoustical Society of America) official article
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TEORI
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The Room Response
Direct sound
Reflected sound tidak direncanakan
direncanakan
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Direct & Total SPL
• Direct SPL adalah nilai energi suara langsung yang di dengar di area audiens tanpa memperhitungkan energi suara pantulan
• Total SPL adalah energi gabungan antara energi suara langsung speaker ditambah energi pantulan dari ruangan
0 dB Threshold of Hearing
20 dB Whisper
40 dB Soft music
140 dB Threshold of Pain
50 dB Soft speech
80 dB Shouting speech
120 dB Hardrock Band
p = 2 x 10-5 Pa
p = 2 x 102 Pa
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Reverberation Time
• Reverberation Time 60 adalah waktu (dalam detik) yang diperlukan oleh sebuah bunyi untuk meluruh sebesar 60 dB.
60
dB
RT60 = 2 sec
RT60 = 3 sec.
A
B
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Reverberation Time
*) Based on US Green Building Council
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Sound Treatment
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Loudspeaker Overlap• Loudspeaker Overlap adalah area
dimana audiens dapat mendengarkan suara dari dua buah speaker atau lebih.
• Efek loudspeaker overlap yang berlebihan mengakibatkan terjadinya comb filtering atau suara tumpang tindih yang tidak dikehendaki.
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C80 Definition• C80 adalah perbedaan (dalam desibel) antara total energi
suara referensi dan total energi setelah 80 mili sekon. C80 dipergunakan untuk memprediksi tingkat artikulasi pertunjukan musik.
• C80 yang ideal berkisar antara – 3dB sampai dengan + 4dB
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PENGUKURAN LAPANGAN
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1,99
Reverberation Time 60 (detik)
2,992,39 2,39 1,99
2,39 2,972,51 2,51 2,39
2,32 2,752,33 2,33 2,32
2,40 3,082,61 2,61 2,40
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Speaker• JBL, JRX 125: 2 buah
– horizontal: 90°– vertikal 50°
• JBL, JRX 115: 4 buah– horizontal: 90°– vertikal 50°
• Visioneer, VS 18S: 2 buah– horizontal: 50°– vertikal 50°
• Visioneer, VS 1515: 2 buah– horizontal: 50°– vertikal 50°
• Beta Three, U15A: 2 buah– horizontal 50°-100 – vertikal 55°
JRX 125
JRX 115
VS 18S
VS 1515 & U15A
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HIPOTESA DAN SOLUSI DESIGN
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• VS 18S• JRX 125• JRX 115• VS 1515
Dispersi Suara Speaker
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Dispersi Suara SpeakerOverlap Suara Sisi Kiri
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Dispersi Suara SpeakerOverlap Suara Sisi Kiri dan Kanan
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Hipotesa Permasalahan• Akustik:
– RT di bawah standarisasi menurut US Green Building Council untuk fungsi sporthall
• Audio:– Adanya perbedaan fase dan delay suara karena banyak speaker– Area overlapping luas dan banyak – Indikasi cancelation frekuensi terdapat di banyak area
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Solusi Design Akustik• Masalah Akustik
– RT di bawah standarisasi menurut US Green Building Council untuk fungsi sporthal
• Solusi Design Akustik– Memasang akustik material pada plafon dengan konfigurasi berundak
untuk meningkatkan difusi suara
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Rekomendasi Material Akustik
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Reverberation Time
• Sesudah < 2,1 s (worst case)• Sebelum = 3,0 s
• Perbandingan Sebelum dan Sesudah
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Solusi Design Audio• Permasalahan Audio:
– Adanya perbedaan fase dan delay suara karena banyak speaker tuning dan positioning
– Area overlapping luas dan banyak positioning– Indikasi cancelation frekuensi terdapat di banyak area positioning
• Solusi Design Audio– Mengganti audio system dengan model yang sesuai dan posisi
speaker yang optimal
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Rekomendasi Speaker
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Rekomendasi Speaker
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Rekomendasi Posisi Speaker
POTONGAN MELINTANG POTONGAN MEMBUJUR*rotasi vertikal = 18° ke sisi bawah*rotasi horizontal = 6° ke sisi dalam
EVA 960EVA 1220
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Loudspeaker Overlap
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Direct SPL (Sound Pressure Level)
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Total SPL (Sound Pressure Level)
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Clarity 80 (music)
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STI (Speech Transmission Index)
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KESIMPULAN
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Kesimpulan• Nilai RT60 menurun dari 3 detik menjadi < 2,1 detik (comply)
Parameter Target EVA Keterangan
Loudspeaker Overlap < 3 1,1 - 2 comply
Total SPL (dB) > 85 95 - 97 comply
Nilai C80 (dB) -3 to +4 -3 to +1 comply
Nilai STI > 0,45 0,46 – 0,58 comply
*perhitungan margin di atas 6% dari output simulasi tabel distribution of values
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Saran• Kualitas akustik dapat ditingkatkan dengan
pembuatan panel diffuser yang berfungsi ganda sebagai penutup ventilasi dan lain sebagainya.