Sorry I'm joining this thread late, but given your setup, John520, my $0.02 may be of some benefit. I'm running a 7.2.2 setup in a 2700 ft^3 room with RBH SV/R LCR speakers and two Hsu subs: one VTF-3 MK4 and and one VTF-3 MK1. Yes, it's a "Frankensteined" setup but bear with me... I did a subwoofer crawl with the MK1 (before I acquired the MK4) and found the best spot for a single sub as well as a good null point. Happily, the best spot was between my AV cabinet and my left main speaker while the null spot was between my AV cabinet and my right main speaker: it makes for an aesthetically & functionally clean setup. No matter which sub I put in either location, bass is powerful, articulate, and even in EVERY seat in my room... including that mother-in-law seat! I have only had experience with Polk, Paradigm, cheaper RBH, and Hsu subs. But given the multitude of reviews and opinions I have read online combined with my experiences, I don't know why anyone would spend more to get the same or less performance (and aesthetics) than what Hsu subs provide; those other subs you are considering cost $100s more than Hsu's flagship. If you want an absolutely ridiculous value, a considerably smaller footprint, and linear response down to <= 18Hz, consider dual VTF-2 MK5s for barely more than the cost of one VTF-15H MK2. (I know I am!) Then again, I can't imagine how good two VTF-3 MK5s or two VTF-15H MK2s would be, but my room is too small for a dual setup with those bigger models. I have both of my current subs only dialed to 1/4 to 1/3 volume and my setup will shake the walls when my processor volume is >= 55% volume! In the end you must, of course, decide what's best for your room and your tastes, but I hope my account helps you and potentially others.