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Since my last post, I installed padding under our carpet, which helps minimally, . . . *******RG: Carpet and padding absorb almost no bass . . . and have been reading about DIY and premade bass traps. You are right, though, Richard: the WAF is extremely low for these monstrosities . ...

I feel sorry for you. My dorm room at the Rochester Institute of Technology about 30 years ago was all concrete and the sound was terrible. Standing waves cause a very uneven distribution of bass frequencies in a listening room. Peaks and nulls. Or "Hot Spots" and "Cold Spots". The...

Cement surfaces cause very irregulat bass response due to standing waves. This plasterboard is more flexible so the standing waves between opposing surfaces are less extreme. Parametric EQ: You can reduce bass peaks at one seating position...