Recital Hall Acoustics

[Don]

Hi,

Simply put, if there are parallel walls and/or floor & ceiling you will
have "standing waves" forming that will cause distortions.

At 10:23 AM 3/22/2003 -0800, you wrote:
>We have the parallel walls in our concert hall.  Breaking them up means
>what?  Putting up blocks of acoustic foam here and there?
>
>David I.
>
>----- Original Message -----
>From: "James Ellis" <claviers@onemain.com>
>To: <caut@ptg.org>
>Sent: Saturday, March 22, 2003 7:55 AM
>Subject: Recital Hall Acoustics
>
>
>> Wim Blees certainly got the most for the money if his $500 worth of
>carpet,
>> wooden strips, and screws solved the problem.  That's about what I would
>> expect an acoustical engineer to have charged for a one-time evaluation.
>> Charging $10,000 for an evaluation, in my opinion, is way out of line.
>> After all, this is a recital hall, not the Cathedral of St. John the
>Divine
>> in New York City with its 200 x 600 ft. nave, and dome high enough to
>> accommodate the Statue of Liberty.
>>
>> Carpet will work wonders for damping out the high frequencies, but it will
>> do little for the mid-range, and nothing for the low frequencies.  In
>Wim's
>> case, it seems that damping the high-end frequencies was sufficient to
>> solve the problem.
>>
>> I mentioned the commercially available panels to inform those facing
>> similar problems that all sorts of options are available to them.  For
>> those who have had any experience in this area, common sense will tell you
>> what you need to do.  Hard, flat, parallel side-walls, and hard curved
>rear
>> walls that bring reflected sound to a focus up in the seating area are
>> killers.  This is so obvious, and yet it happens all the time because too
>> many architects seem to know nothing about acoustics.
>>
>> Jim Ellis
>>
>>
>> _______________________________________________
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>
>_______________________________________________
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>
>

Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T.

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