The Velodyne SMS-1 sub controller combines room analysis, PEq room correction w/video readout, and an active x-over. It also allows multiple EQ curves (for movies vs music, for example). I believe that it's easily the best $500 I've ever spent on 2 channel.
I also use a a pair of Velodyne SPLR-800 subs, but I'd probably point you to SVS subs which seem to produce better specs and come very highly recommended by knowledgeable subwoofer types.
Good Luck
Marty
BTW, if you want further refinement, you can use the SMS x-over as a low pass only. This gets A/D/A coversion out of the main signal path. You can either run a second pre-out to your main amp and run the main speakers full range, or insert an NHT X-2 (app $300) to actively roll off the bass in your mains without A/D/A. The NHT should still be widely available despite the company's "leave of absence".
I also use a a pair of Velodyne SPLR-800 subs, but I'd probably point you to SVS subs which seem to produce better specs and come very highly recommended by knowledgeable subwoofer types.
Good Luck
Marty
BTW, if you want further refinement, you can use the SMS x-over as a low pass only. This gets A/D/A coversion out of the main signal path. You can either run a second pre-out to your main amp and run the main speakers full range, or insert an NHT X-2 (app $300) to actively roll off the bass in your mains without A/D/A. The NHT should still be widely available despite the company's "leave of absence".