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From: tbmoas58 on 5 Nov 2007 17:53

"bigsphinx" <bigsphinx(a)gmail.com> wrote in message
news:1194299403.697927.189740(a)57g2000hsv.googlegroups.com...
>
>> I suggest you hire a acoustical consultant to come measure your room
>> do some burst/%alcon and rt60 evaluations
>> discuss your end goals and develope a solution
>
> Thanks, I'll do that!

call on architectual firms or contact the AES(Audio Engineers Society) for
contact info on specialists around your area
all this stuff should be easily found on-line
George
>


From: Peter Larsen on 5 Nov 2007 17:23
bigsphinx(a)gmail.com wrote:

> I have a 70' x 35' room that I intend to use as a performance hall,
> for music ranging from noisy metal bands to acoustic/chamber music.
> Concrete floor, 12' high concrete-block walls.

Wood. Lackered wood, thin panel with bass absorber behind probably OK.
Marble. Marble is good, it carries the cremona sound well.

> The roof is 18' high in the middle. We'll put in thick fiberglass
> insulation on the ceiling,

You did say chamber music. Did you mean it? - it needs a live and bright
sounding room that carries well.

> and leave the rafters open (A/C duct and main house speakers
> will go up there too).

I don't know what you mean with rafters, can't comment.

> The concrete floor will remain uncovered,

Carpet is likely to be a very good idea. Add also some audience ....
audience is good, it absorbs very well down to fairly low frequencies.

> but we obviously need to treat the walls.

Yes, with laquer coated wooden diffusors that break the flutter echo up.
Think stealth man, think stealth .... O;-)

> I've been advised to install 4' x 8' sheets of
> styrofoam insulation over most of the wall, and to cover them with
> fabric to make it all look better.

You DO want to get permission to let audience enter the heall, don't you? -
I can't envision that to happen with styrofoam anywhere near the county the
hall is located in. Also ... well, uhm ... it does NOT have any acoustic
properties worth mentioning.

> (I plan to use thick stage
> curtains behind the stage and on either side of the audience, so that
> I can expose the bare walls as needed during acoustic shows.)

Kill the ceiling as you intend and only amplified events will work. An
acoustic show is not like MTV unplugged, it is NO mics, NO amplification.

> Has anyone here installed foam panels in this way? What kind of
> fabric did you use? How did you attach the fabric to the foam, and
> the panel to the wall? How durable did it turn out to be? Did it
> dampen the sound as much as you'd hoped?

You need some kind of modeling of what will happen if, so that you don't
have to do it by trial and error.

> Or, does anybody have some better ideas for treating these walls?

Wooden diffusors and some marble panels comes to mind. Marble does wonderful
things to strings, fretted or unfretted. There may be cheaper alternatives
with similar functionality.

You may need the wisdome of the learned gentlemen over in

alt.sci.physics.acoustics,

so I added a crossposting. You can get some guidelines and some ideas, but
the pointer you really need is to a nearby skilled acoustic consultant. It
will cost ya, but getting the room wrong will cost ya mor.


Kind regards

Peter Larsen





From: Paul Francisco on 5 Nov 2007 18:34
On Mon, 05 Nov 2007 09:17:54 -0800, bigsphinx(a)gmail.com wrote:

>I have a 70' x 35' room that I intend to use as a performance hall,
>for music ranging from noisy metal bands to acoustic/chamber music.
>Concrete floor, 12' high concrete-block walls. The roof is 18' high
>in the middle. We'll put in thick fiberglass insulation on the
>ceiling, and leave the rafters open (A/C duct and main house speakers
>will go up there too).
>
>The concrete floor will remain uncovered, but we obviously need to
>treat the walls. I've been advised to install 4' x 8' sheets of
>styrofoam insulation over most of the wall, and to cover them with
>fabric to make it all look better. (I plan to use thick stage
>curtains behind the stage and on either side of the audience, so that
>I can expose the bare walls as needed during acoustic shows.)
>
>Has anyone here installed foam panels in this way? What kind of
>fabric did you use? How did you attach the fabric to the foam, and
>the panel to the wall? How durable did it turn out to be? Did it
>dampen the sound as much as you'd hoped?
>
>Or, does anybody have some better ideas for treating these walls?

I'd find a consultant to look it over and be VERY sure you follow fire
codes. One guys cheap solution probably won't fix your hall, and
fabric on styrofoam sounds real scary flammable. U wanna check those
stage curtains to be flame-retardant too.

Good luck,
Paul
From: me on 5 Nov 2007 20:27
On Mon, 05 Nov 2007 09:17:54 -0800, bigsphinx(a)gmail.com wrote:

>I have a 70' x 35' room that I intend to use as a performance hall,
>for music ranging from noisy metal bands to acoustic/chamber music.
>Concrete floor, 12' high concrete-block walls. The roof is 18' high
>in the middle. We'll put in thick fiberglass insulation on the
>ceiling, and leave the rafters open (A/C duct and main house speakers
>will go up there too).

Last place I saw with speakers up in the ceiling was un-listenable... the sound
source needs to be in front with the band...

>The concrete floor will remain uncovered, but we obviously need to
>treat the walls. I've been advised to install 4' x 8' sheets of
>styrofoam insulation over most of the wall, and to cover them with
>fabric to make it all look better.

Who advised you? A monkey? Your dog? Not only will that do nothing for the
sound, it's illegal because of fire hazard... ILLEGAL!

You need to use acoustic fiberglass and fire-code-rated panels, usually a
treated wood product...

> (I plan to use thick stage
>curtains behind the stage and on either side of the audience, so that
>I can expose the bare walls as needed during acoustic shows.)

Don't expose the wall BEHIND the musicians!! You'll create a comb filter echo!
Also the walls will have limited success... You need a panel or panels facing
the stage... up in the ceiling... like a real concert hall... or just leave the
bare ceiling alone...

>Has anyone here installed foam panels in this way?

That band that burned down a night club did...

Go get a building experts opinion somewhere.

From: tbmoas58 on 5 Nov 2007 21:51
>> Concrete floor, 12' high concrete-block walls. The roof is 18' high
>> in the middle.

sounds like the kind of romm bony wanted to paint with truck bed liner to
control the sound in

Dear OP here is a hint
if bony pipes up
disregard him, out of hand
george


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