If I may be so bold to put my two cents in. I have dual REL Storm III's in my system. What I found that worked quiet well was not to use the spikes at all. Rather go down to the hardware store and buy a 15x15x2" paver made of concrete. Thats what REL recommends and I found it to tighten up the bass nicely. With recommendation to a power cord. Since the frequency is somewhat limited I built a similar cord to my Silver-Rhodium Gain Cord that I sell. Only I made it out of copper wire rather than silver, it works very nicely to maintain the dynamic power that a subwoofer needs.
