Hey guys I need some advice. I have a SVS 20-39PCi which I've had since Oct. 2003 and I love it. Since than the SVS bass bug bit me and now I want more! My original idea a few months back was to purchase another SVS 20-39PCi but now I decided I want even more! So I've decided to sell the PCi and purchase either a PC-Ultra or a PB2-Plus. First off are there any good threads anyone can recommend comparing the two? Honestly when is the better of the two? My thoughts are the Ultra will go lower but not sound as loud and that the PB2-Plus will sound louder but not go as low. Is my thinking true or can a PB2 go as low with calibration? I prefer lower hitting bass. I would like to get a PB2 but I have this fear that it won't hit as low. I know about the port plugs but from what I've read people prefer them without or one port pluged for 20Hz. Please help me decide.