[GreenKeys] Foam

[Richard Knoppow]

    Good question. Acoustical foam is a porous foam meant to 
absorb air conducted sound. Another sort of foam is used on 
mechanical parts, like the cases of typewriters, to damp 
vibration. This is not porous but rather heavy. Often has 
adhesive on it. The idea is that by damping the vibration of thin 
panels they can not act as sound radiators. Acoustical absorbent, 
either foam or fiberglass or old fashioned felted horse hair, is 
not a very good dampener. The damping foam looks something like 
really thick tar paper.

On 7/28/2019 11:16 PM, Clay Archer wrote:
> I think he is looking for acoustical foam to dampen the sound, 
> not the blotter foam pad under the TU.   I may be wrong….


-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL