On the draining of resonance.....

There's no arguing with bedrock. Yes, newer homes have engineered floor joists that flex quite a bit with foot traffic. KN, are you in the basement, or on a slab?

Yep the construction in most good quality newer homes is good when it comes to earthquake tolerance but bad when it comes to interacting with your hifi as well.

Long live Bedrock!

You have to isolate your speakers from interacting with teh floor otherwise to preserve detail and clarity. Like isolation pads used under a subwoofer (I place my floorstanders on Auralex Subdude isolation platforms) or monitor stands also designed specifically to isolate monitor speakers from what they stand on (I use Isoacoustics pro monitor stands ).

If you have your speakers sitting directly on most modern suspended plywood construction floors, you are doomed to mediocre sound until you get some form of isolation in place.

The real reason cement floors work well is they do transmit the very low frequency vibration such as that produced by the motion of the Earth's crust nearly as much as standard flooring. Cement does not bend nor exhibit the dreaded trampoline effect.

Ooops, I meant do NOT transmit very low vibration....

Basement. We had problems with unstable fill on the building site so our basement slab now sits on top of $26,000 worth of crushed rocks. My turntable sounds great. Highly recommended. LOL

kn