At $1500, you can get dual Hsu VTF3s, and for just a bit over that you can get dual PSA XV15s, either of which will knock out the SVS subs and should come close to equaling the Klipsch subs in output if not match or exceed them, and beat them in extension. But at that Klipsch discount, it looks like you could get three of them which would be an insane value at $1500. If you set three of those brutes up correctly it will give you a beautiful FR at every seat. If you can only get two subs, for for PSA's or Hsus, but if you can accommodate three, get the Klipsch's. SVS's are not competing at this point in output or extension.