I have not heard the SVS PB12 yet, so I can't comment on it, but I have heard only good things about the SVS products (except their size). I have a VTF3 MKII. I place it on its side, under an end tabe (WAF), with the driver facing the sofa. Hsu Research confirmed that placing the sub on its side is ok. It's in a corner between a sofa & a love seat (perpendicular placement), and the Hsu is excellent for both movies and musics. I have Polk RTi speakers, and the Hsu blended in very well w/them. After calibration w/Sound & Vision Disc and a Rad Shack meter, the volume is slightly less than 9 o'clock. (0 volume at 6 o'clock), the Hsu can shake the pictures hanging on the back wall, and I have a large room. Can you order both and test them out in your room? They both have 30 days return guarantee, I believe.