Acoustic Foam

[Gary Fluke]

Ladies and Gentlemen,

One of the basic keys to the reduction of sound transmission is to surround 
the sound source with an encapsulated air space.  In general, the greater 
the distance between the boundaries of the encapsulated air space the lower 
the frequency range which will be absorbed.  When the air space is filled 
with porous insulation, such as foam or fiberglass, the amount of the peak 
frequency absorbed will be reduced but the range of frequency reduced will 
be increased.  A moving blanket over the back will probably help nicely.


Gary Fluke
Snohomish, WA


----- Original Message ----- 
From: "Rob Mitchell" <tpa2sfr at pacbell.net>
To: <pianotech at ptg.org>
Sent: Monday, November 05, 2007 9:52 AM
Subject: Re: Acoustic Foam


> Just to clarify please (I've got a customer with a Schafer & Sons upright
> that's interested):  It sounds like you cut the acoustic foam to fit 
> between
> the vertical beams in the back of piano and then make sure this foam is 
> snug
> up against the soundboard?  Do you then cover the entire back with 
> anything,
> like a moving blanket?
>
> Rob
>
> Mitchell Piano Service
> www.mitchellpianoservice.com
> (415) 994-1030
>
>