"By rigidly coupling a loudspeaker enclosure to a floor by means of a "spiking" system, it is possible to dramatically improve clarity, stereo imaging and tighten up the bass response" From PE. Is this true? I don't quite understand the physics behind this. My sub is downfiring on hardwood floor. Should I consider buying spikes. Also should I put something under the sub (Like a ceramic tile), so that the sound stays in the room, or would it be better just leave the sub firing into the hardwood? On some high end yamaha subs (downfiring), they put some kind of a cone underneath the sub to direct the sound in all directions. Would that make much difference?