What are the reasonable requirements of a PA system? - diyAudio
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Old 3rd December 2009, 05:09 AM   #1
CLS is online now CLS  Taiwan
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Default What are the reasonable requirements of a PA system?

Hi there,

A friend of mine is in charge of a purchase for audio equipment of an auditorium (size about 600 seats). He asked me how to request the contractors.

I think, a list full of brands/models/qty's is meaningless. Instead, the sound should be what we're after. But how to 'quantify' the sounds in an objective way?

How about: at some particular seats (near the center region), measured frequency response should be:

40 Hz ~ 12kHz, +/-3dB @ 108dB average SPL
and 32 Hz/16kHz are better than - 6dB;

for outer regions: 50 Hz ~ 10kHz, +/-4.5 dB @ 105dB average SPL
and 40 Hz/12kHz are better than - 10dB

And decay time (T60) should be under 1 sec. (or others) ... etc.

Are those reasonable? Are there any other practical criteria which can be measured and tested under witness when checking for acceptance?

Any comments are welcome, thank you
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Old 5th December 2009, 12:57 AM   #2
CLS is online now CLS  Taiwan
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Anyone? Any inputs?

Thanks a lot.
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Old 5th December 2009, 01:05 AM   #3
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Consider that LF energy can destroy the building over time. Ever wondered why the speaker systems designed for the earthquake movies disappeared? The vibrational effects on building materials is a major issue.

Terry
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Old 5th December 2009, 01:25 AM   #4
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There are huge differences in requirements based on what the system will be playing. Is it a musical/theatre venue or a conference venue or what?
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Old 5th December 2009, 05:15 AM   #5
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If he has the budget, he should contact the local Meyer Sound Office. it won't be cheap, but it will sound very good.

600 seats is not huge. Unless you need insane rock levels.
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Old 5th December 2009, 05:27 AM   #6
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Hi CLS, I would suggest going through a few sites on church sound systems which will have similar requirements.
Google search results
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Old 5th December 2009, 08:36 AM   #7
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Look up Krix Speakers and drop them an Email. They supply around 50% of the speaker systems for thearters in Austral/Asia. A lot is riding on your opinion, get it right by asking people who do it for a living and get it right. Their advise is free and if they do manage to sell you something it will do the job.

Terry
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Old 5th December 2009, 09:18 AM   #8
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I highly recommend hiring a consultant to draw up a system design for you. You can express your desires to the consultant who will be able to tell you if what you want is within your budget. If the consultant starts pushing brands, you should move on.
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Old 5th December 2009, 09:35 AM   #9
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Have a quick read of this article at ESP

PA Systems
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Old 5th December 2009, 06:04 PM   #10
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Jim Brown of Audio Systems Group has several papers on auditorium and church PA systems:

Audio Systems Group, Inc. Publications
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