yeah, I was gonna say, that VMPS is widely reputed to be among the most musical subwoofers available. You'll probably like the VMPS New Larger Sub.
http://www.vmpseurope.com/e/p-sub.htmWhen you read how much VMPS Designer Brian Cheney knows about the role of subwoofers in a sound system and the design of powerful yet musical subwoofers, you just have to trust the guy. He invented his own bass loading, the Slot-Loaded Passive Radiator.

This is the Larget Subwoofer with the optional 12" Woven Carbon Fiber "Megawoofer", a beast of a driver with a double-stacked magnet structure, WCF cone, and natural rubber surround. The Phase Plug in the center eliminates high air pressure below the dust cap and simplifies the design. The Megawoofer has a 16mm one-way excursion. You can see the passive radiator on the bottom. It fires into that coupling chamber which is formed between the base and the floor, and the output exits through the slot. That other driver is a 15" polycone woofer. Now you can get that woofer Megawoofer'd as well since VMPS now offers the 15" Megawoofer option.
If you decide on any VMPS models (Original Sub featuring 12" woofer and 15" Passive Radiator, 215 Sub featuring 15" woofer and 15" Passive Radiator, or Large Sub with 12" and 15" woofers and 15" Passive Radiator) then head on over to the VMPS Forum here on AudioCircle and look at the dealer list. The VMPS website is in the process of being revamped. In the mean time, all the stuff is on AudioCircle.
Amplifier Power: Get a QSC Audio RMX850 amplifier and bridge it into a mono amp. Then strap the two woofers of the Larger together for a 4-ohm load. You'll get a good 600w of power. Then just use an active crossover before the QSC.