A thousand audio uses for memory foam. Or maybe just one . . .


So i have this old memory foam topper for my bed, and before I cast it off completely, the DIY part of me I got to thinking, could it be used for acoustics in any way? I don’t have the slightest clue as to the frequency it would be good at, but cutting it into various rectangular shapes and sizes first comes to mind. I could glue them to some plywood and diffract and/or diffuse sound. 

Any other thoughts or suggestions?
last_lemming
Try different small shapes and sizes... 2x2x1, for example,
and even smaller than that.

Place on components, at the end of cables, speaker cabinets.
Experiment with different foam pieces as headphone pads too.

Different sizes, weights, and foam densities will yield different results.
Even try the stuff that is used in packaging.

You may be astounded at how foam can tame micro vibrations.
Think small.
If you leave it flat, it won’t do much, but(perhaps) absorb some very high frequencies. If you raise portions into waves, rather than cutting it up, you may be able to use it for absorption/diffusion. ie: If it’s big enough: maybe a couple for your early/first(side wall) reflection points. Or- if you’re seating close to a back wall, use it to kill the reflections behind your head.     Finding reflection points: https://www.youtube.com/watch?reload=9&v=Oa5vfEIXyok
Cut a piece exactly 20x14. Cut another piece exactly 14x10. Wrap them in a neutral color acoustically transparent fabric. Place on ottoman. Very comfortable.
Acoustic foams generally are very bad for the sound, the most agregious example perhaps being SONEX, the worst scam ever perpetrated on gullible naive audiophiles. Another prime example is the IKEA Puang foam-filled chair. It looks like such a nice inexpensive comfortable chair, too. 😛 is Memory Foam an acoustic foam? Who knows? But it looks too close for comfort. Maybe if the Memory Foam is NASA qualified. 😀
last_lemmingvery interesting query. We know that some speaker manufacturers use cotton or wool in their cabinet designs. Perhaps memory foam could be the next anti-vibration, sound absorption, evolution? I look forward in reading about any experiments conducted.

Happy Listening!
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I’m not sure what this adds to the discussion, but a couple of years ago I got a new bed.  It wasn’t memory foam but rather latex over individual coils.  Incidentally latex never breaks down, unlike all types of foam.

The queen size mattress was made of 2 side by side latex pieces to allow different firmness on each side, but I could feel the gap and they sent me 1 huge latex piece to replace the two.  Before I sent back the latex pieces, I tried one in the corner of my room.  It had lots of small holes.  It definitely seemed to absorb bass and inquired what it would cost to keep them (I was secretly hoping the company would forget about picking up the now slightly used latex) but they indicated it would cost over $800 for me to keep the pieces.  I Don’t know if anyone has ever experimented with latex as a sound treatment, but it seemed like to had potential.

Earlier I had a great idea for you and that memory foam, but I thought I would sleep on it....