Dear all, On SVS site, the description for PB2000 says "Borrowing extensively from the legendary SVS Ultra Subwoofer line", technically what exact are the things it borrows from the ultra subwoofer line. I am in the process of making decision between between PB1000 and PB2000, for my dedicated HT room (My room is 16 feet length x 12 feet wide x 8 feet height and is closed from all sides). What exactly is the difference between PB1000 and PB 2000. I presently own the Ultra towers/ultra center/ultra surrounds. I love my Ultra speakers. Infact everyone who hears them becomes a huge fan. My friend owns a PB1000, he brought it to my house/HT room. I took a 2 hour demo with that. I like the clean/ distortion free sound of the SVS Subwoofers offer. Correct me if i am wrong, i think due the this clean distortion free nature of SVS , even if i put daul PB2000's in my small HT room i will get the same clean distortion free sound.One more question i have is that most often reviewers label subwoofers according to room size, does that really matters? Can't we just keep the gain low and fit a large subwoofer in a small room? waiting eagerly for response.