I have a pair of HSU VTF-2 subs. The room is 20X21 with 8'8" ceilings. All drywall room. Marantz 6013 receiver with single subwoofer output. Mini DSP 2X4HD and Audessey turned off. I have been playing with delays, inverted etc and i just cannot get a higher output above 55hz unless i have my front towers plugged in. But i have my subvcrossover set to 250 and all speakers set to small and 80hz. Not sure if i am a candidate for 4 subs but i have tried to place my subs in various locations that i can do in there. The theater section is offset to the side because i have a kitchenette\/bar area to the right of theater side. Not sure if i can attach the REW graph to this or not but i am not sure what direction to go right now. Trying to read as much as i can but as a beginner i seem to be getting overwhelmed.