Love it!
I have a 2 sub setup, a HSU VTF-3 HO Turbo, and a HSU MBM-12. Here is the breakdown:
VTF-3 HO Turbo is a big mean 12" 500 watt beast, set to go from 16 Hz to 50Hz.
MDM-12 is DESIGNED to operate from 50 Hz to 150 Hz. It has a lighter, stiffer 12" woofer for punchy mid bass. It sports a 350 watt amp.
My AV system is located in my bedroom, because I'm a wheelchair user, a C 3-4 Quadriplegic, and spend a lot of time in bed. Test placement of the sub wasn't an option, but it does pretty well between the mains (the VTF-3 HO Turbo), while the smaller MBM-12 is across the room next to my bed (perfect near field).
My Emo prepro has a single RCA out for the subwoofer, but has plenty of drive, and a handy adjustment button on the remote. So, using a Y adapter I have run a single cable to each sub. The VTF 3 is set to maximum extension, and the internal crossover is set at 50 Hz, where the MBM-12 picks up duty and is crossed over @ 80 Hz by the Emo.
The result is pretty darn cool. A buddy I meet here on Audioholics (khemist1) is bringing over some test cd's and action movies so we can test this beast. I've got my digicam ready. Will report later!