I can't seem to decide, I thought i had narrowed it down to SVS PB1-ISD or PB2-ISD. The size of the PB2 is holding me off, and feel the PB1 may not be enough for my 6000 cubic foot HT room. Subwooferinfo.com has good spl specs on the RSW-15. The RSW-15 is smaller than the PB2 and would fit better. PB1 600.00, PB2 900.00 RSW-15 900.00 plus on the net. Would the RSW-15 be a good alternative between the 2 SVS models for both size and performance. I would love to make a decision today. Thank you for your input.