Re: [TCLUG:14213] Sound Proofing

[Philip C Mendelsohn <mend0070@tc.umn.edu>]

On Thu, 2 Mar 2000, A Carlson wrote:

> I haven't used it yet... I've wasted the last two months trying to find a
> local dealer and haven't had any luck.  I talked to a couple studios in the
> area and this is what they suggested to me.  There are some local
> alternatives but you need to purchase it in 100 foot lots, or else its the
> foot thick angled absorption stuff for studios.

This is absurd.  They were suggesting things like Sonex or Illbruck or
some of the other commercial foam.  This is a poor recommendation from
a cost effectiveness point of view.  Most studios spend way more
than they should for poor acoustic performance.

What you want in type 704 acoustic absorbers.  However, for the same
absorption characteristics, you can buy fiberglass, foilbacked sheets of
814-FSK insulation.  They generally come in 2'x4' sheets, so one would
probably go a long way.  However, to do any meaningful absorption, you
want 4" thick.

I have some left over that you can have, but I don't think I'd recommend
putting it in the case itself.  I'd probably do some sort of acoustic case
for the whole thing.  That's the way this problem has typically been
solved for the last 30 years.  

E-mail me privately if you want to pick up some of the sheet or two I have
left.

> If (when) I get this I'll be ordering the 1/2"embossed foam, as its for
> absorption and not blocking... that should take care of a good chunk of the
> ambient noise that gets through the vents.  The only problem I'm having with
> the plan is figuring out a way to dampen the power supply and other exposed
> fans.

Your best bet is probably to encase the whole thing and pipe fresh air
in.  The fan noise is supposed to stay in the pipes.  You need to make
sure that you have good caulk seals on all joints in this type of work
too.

Sorry if this is a little off topic, but I'd hate to see someone by a lot
of expensive, gimmicky foam and end up with it not working very well.

Phil M

-- 
Life is complex:
It has real and imaginary components.
                     --Unknown