Hi Klas--
A floating wooden or metal stud wall booth with an exterior made of 2
layers of 5/8" drywall and 8-12" of fiberglass batting on the inside
can drop the ambient level 40dB, maybe 45-46dB. I made the interior
walls by jamb-fitting homesote sound paneling. Two layers of carpet
on the floor. The biggest challenge/expense is the entrance door and
seal. I added another seal to an 2.5" solid door and it was almost as
quiet as the walls. Two 2" doors in one thick jamb would be better. I
floated the 800 lb structure on four rubber closet (toilet) washers.
Every joint and seam must be caulked. Ventilation is a bit of a pain,
but that can be done cheaply too. Rob D.
At 11:43 AM -0500 1/13/07, Walter Knapp wrote:
>Posted by: "Klas Strandberg"
>
>> I would say that amps in general perform their best noise values at
>> max gain, say 60 db.
>
>The best sound out of mic preamps generally does not occur at max gain.
>Generally the sweet spot is in the middle half of their gain adjust.
>
> > Do you know of any simple trick to make a "silence chamber"??
>
>There's plenty in the literature on making acoustic test chambers. There
>are a number of companies that can supply the sound deadening material.
>You can even buy the entire chamber ready made. Of course that
>convenience is costly.
>
>Walt
>
>
>"Microphones are not ears,
>Loudspeakers are not birds,
>A listening room is not nature."
>Klas Strandberg
>Yahoo! Groups Links
>
>
>
--
Rob Danielson
Peck School of the Arts
University of Wisconsin-Milwaukee
http://www.uwm.edu/~type/audio-art-tech-gallery/
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