Originally Posted by kweezr
I'm on a slab with hardwood and worked great here.
The hardwood is likely not bonded to the concrete, so you still get vibration in the floor, which causes vibration everywhere. I could see the benifit of using the Subdude on a hardwood floor over concrete.
The subdude is made to absorb vibrations from the sub. So that the bass you hear and feel is from the sub, not the vibrations of the floor, or the walls coupled to the floor. If you have carpet over concrete, spikes will be fine. You can't vibrate a concrete slab! If you have any kind of elevated floor, I can imagine that the Subdude could be benifical.
EDIT: When I said concrete slab, I was referring to a concrete slab-on-grade, not an elevated concrete slab. As indicated by the comment: " If you have any kind of elevated floor, I can imagine that the Subdude could be benifical."