In reply to:

The ultra is far more expensive, and is doesn't seem to have the same range as its cheaper brother (PC-plus goes down to 16HZ, ultra is only 20)


The PC-Ultra is tunable down to 12 Hz via the port plugs and the adjustable subsonic filter in the amp.

I've got the PB2+ so I can't personally comment on the cylinder series. But I've read on hometheaterspot.com (in the SVS forum) that the PC-Ultra is very impressive.

Jason

M80 HP v4, VP160 v4, QS8 v1 (3 in 6.1 layout), SVS PB12-Plus/2, Parasound Halo A21, Denon AVR-X4100W