I run two Rel Storm IIIs with my Audio Physic Virgo IIs. I ran a test CD to set up my Cross over point on my Rels. I found in my large room my Virgos roll off at about approx 38 Hz. Higher than the 34 Hz rating. My Rels at about approx 22-24 Hz. Again not as low as rated. I have my Rel cross overs set at 36 Hz. So every room becomes part of a complex setup problem to maximize the intergration of the subs with the the speakers. All of us who do not have dedicated sound rooms must compromise. Just find what works best in your room and situation. I run my Rels high level inputs off the speaker posts (most Subs do not have high level inputs). That way I get Left and Right channel subs...works best in my room, I have a very cohesive union of sub & speaker. Tight articulate base that seems to work magic all the way into the mids. I used Stereophiles first test CD and a well known setup CD the sound track to the movie Sneakers. The track is called "Cosmo...Old Friend"
Good luck, Greg
Good luck, Greg