Acoustics, walls and what they're made of?

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There is a lot of published material on the subject, and much of it can be hard to understand.

Thick concrete will be reflective of even very low bass. Wood and drywall are "flexible panels" that tend to absorb bass. (It takes energy to flex them.) Most of the best sounding rooms I've heard were a mix of stone, plaster and wood - with a fair amount of furniture around.
 
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