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Post subject: Delay for long halls?
Posted: Wed Feb 16, 2011 10:18 am
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Aspiring Musician
Aspiring Musician

Joined: Wed Feb 16, 2011 7:24 am
Posts: 434
I need to use my two Passports (a 500 and a 300) in a roller rink. It's a long, narrow hall.

Another sound engineer tells me that when placing multiple speakers in a hall, it is a good thing to delay the signal going to the mid-hall speakers about 1 millisecond per foot for the distance between the stage speakers and the mid-hall speakers, so the sound waves are properly reinforced for people at the back of the hall.

Do you know of a device that I could insert between the 500 and 300 (where I'm patching them together with a 1/8" stereo patch cord) that would add this controllable delay?


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Post subject: Re: Delay for long halls?
Posted: Fri Feb 18, 2011 3:07 pm
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Fender Staff

Joined: Tue Feb 09, 2010 1:39 pm
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Location: Scottsdale
How long is the hall? Personally, I don't think that you will need to worry about this. Time adjustments are usually used in large concert halls with huge PA's. A dbx Driverack is one of those units that I can think of.

Ken

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Post subject: Re: Delay for long halls?
Posted: Sat Feb 26, 2011 5:00 am
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Aspiring Musician
Aspiring Musician

Joined: Wed Feb 16, 2011 7:24 am
Posts: 434
If the guideline is one millisecond per foot, then speakers 30' apart along a proportionally long hall would need a 30ms delay to avoid phase issues for anyone in earshot of the rear speaker at frequencies that this distance difference would put put them 1/4 to 3/4 out of phase.

Since frequencies have a wide range, a simple phase switch won't help, since you'll just be choosing which half of the notes (and harmonics) that you'll be reinforcing and which half you'll be partially canceling.

In theory, anyway. Unless my imagination is wrong.

A 60' hall might get 30' for speakers halfway down the hall. 60' is not a particularly long hall.


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