If you use a pair of Velodyne SMS-1's (stand alone bass EQ boxes) with any good sub, you get remote control EVERYTHING (levels, crossovers, EQ, EQ points, Q size, slope, subsonic filter and its slope, phase, five settings each, etc.) And it visually shows you the effects of sub placement, room EQ, all in real time and on your tv/screen. They're each $599 (mono) and invaluable for integration to mains and HT. You can set them up for music, and a compleetly different setting for LFE/movies, if needed, all remotely. To me, an incredible tool. I'll never dso without them, unless you get Velodyne DD series subs (whcih have them built in).... but why not shop for the best subs for your needs and budget.
Ted
Ted