Studio build: Manville Insulation question

Archived from groups: rec.audio.pro (More info?)

Brian,

> found something called "whispertone wallboard"...is this the product most
similar to Owens Corning 703? <

I just looked up the specs for both, and the JM wallboard you mentioned is
about half as effective as 703 at the lower frequencies. I believe JM does
make other products that are closer in performance to OC 703, so keep
looking. Or maybe call them to ask which of their products you should get.

--Ethan

Archived from groups: rec.audio.pro (More info?)

"Coastrdstudio" wrote...

> I looked up a "rigid" fiberglass product on the Johns Manville website,
and
> found something called "whispertone wallboard"...is this the product most
> similar to Owens Corning 703? It's hard to tell from the picture, but it
> looks the same. Anyone use this material for internal wall insulation, or
> is there a different Manville product that is better for sound absorption?
> (Also to be used as fabric-covered wall-hanging absorbers)
>
> Their rep told me that it would be the "Insulshield 300" listed under
> commercial insulations on the web site.

Hi Michael,

I have a sample of Whispertone Wallboard here. It is about 6lb/cuft and
quite rigid. I think 703 is 3lb/cuft. The Whispertone has a few advantages
in that is is available in a white as well as yellow and it is
'specifically' engineered for acoustics I guess. Anyway, for making fabric
covered wall hangers it would be very good. If you incorporated an airspace
behind then it will have better absorption coef. as low frequencies than 703
(for the same thickness, of course). I'm not sure what thickness's it's
available in.

I believe the rep is correct in saying that the Insulshield product would be
the best match for OC703. Just choose your density based on requirements.

Listen well,
Dave.
--
David Vanderploeg
Naturally Digital