I have a pair of original SVS Drivers sitting around so deciding what to use was no problem. I am building a pair of Subs for music (got a tempest for HT) for my MTM's to sit on. I plan to bi-wire this new set up. High pass MTM. Low pass SVS. Crossover to come in another post.I found most of the stats for the SVS drivers but still want to find out the rest so I can run them in Win ISD to build the best box poss. This is what I got: FS-21 hz Qts-.38 Qes-.39 Qms-6.6 Vas-4.6 ft^3 130 liters Impedance-4ohms Re-3.2 This is what I would like: SPL X-max power handling I don't think I need these other specs but it wouldn't hurt to know them. Thanks!!!