Bass definition with many, (not all) vmps speakers comes in the form of adjustment by means of small amounts of the putty that comes pre installed on the passive driver. This adjustment along with adjustment of rear pots on the speakers will do far more than any spikes could ever do. The speakers do not come tuned to your room, I have a pair of super tower/r's for six years now. These big 200+lb. speakers do not need to be spiked to the floor.
