Join Date: Jun 2001
Location: Amish Country, PA
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Probably because spikes don't prevent vibration. They couple the sub to the floor, making the problem worse.
You want rubber feet, the thicker the better.
*edit* To clarify, spikes prevent the enclosure itself from vibrating, or at least reduce it. That can be helpful for speakers, but usually not subs. Generally you want to decouple the sub from the floor, so that it doesn't transmit vibrations into the floorboards. That can cause the whole floor to become a huge speaker, smearing the bass sounds. So you want to put the sub on a shock absorber of some sort so that it doesn't pound the floor.
The sub enclosure itself should be rigid enough that vibration isn't an issue. If it buzzes and rattles it wasn't built well.