Recital Hall Acoustics

[David Ilvedson]

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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