My speakers (Unity Audio Sig 1's from the early 90's) have a 10 inch woofer downfiring at the bottom. Felt like I was missing deep bass (realizing of course that I'm not going to get much below 32Hz in any event). They sat on spikes which went through my carpeting to a subfloor which has the basement down below it. Then I tried taking the spikes off and sittng the speakers on thick marble floor tiles with Vibrapods between the speakers and the tiles. Giant improvement in the depth and clarity of the bass!
