I've owned a Hsu VTF-3 HO Turbo since July of 2007. It's an awesome sub, and I've got it setup for maximum extension, down to 16 Hz. Movies are what you would expect from Hsu's flagship model, deep, pounding tear down the house bass.
But its time to kick it up a notch, so I've ordered a MBM-12 to hit hard between 50 Hz and 80 Hz, where the VTF-3 HO Turbo is at a disadvantage because of its heavy deep bass driver. The MBM-12 also has a 12" driver, but its a lighter stiffer driver, made to move faster, and give that punchy mid bass, for example, dance music.
Setup will be easy. A Y adaptor on my Emo Prepro, and one RCA cable to each sub. The MBM-12 will operate from 50 Hz up by design, and my Emo Prepro will cut it off at 80 Hz. I'll set the VTF-3 HO Turbo to use its built in crossover, and to only work from 50 Hz down. Quite simple.