On 11/4/07, Tom Servinsky <tompiano at bellsouth.net> wrote: > There is a big difference between foam mattress material and acoustical > baffle foam. Recording studios having been using this material for years to > insulate the interior space against outside noise. Can't say I have ever > seen a recording studio pad the walls with mattress foam. I'm not sure how > the acoustical/physical characteristics plays into the egg crate shape, but > it does contain sound extremely well. > That being said, any material (be it foam, blankets, or anything) is going > to aid in retarding sound from the bottom of the piano. The question is how > much containment of sound are you hoping for. We've experimented with just > about everything and for the extra money, the high grade acoustical baffle > foam is well worth the extra cost. I agree with you, Tom. I was responding to what Israel said about using a foam mattress cut to size. That will reduce the sound, but as I said, the acoustic foam is denser and would do a better job. What I was talking about was after the acoustic foam was in place on top and bottom. I was wondering if a foam mattress might help *in addition* to what was already there. It did make a difference, but not significant enough. Sorry if I worded it poorly. Having done my little experiment on that job, I will use acoustic foam in the future if ever I need to reduce the volume. Someone else before me had put a sheet of fiberglass insulation in there. That doesn't work well at all, just in case anyone was wondering. <g> JF
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