I have 4 tempests laying around from my old car system and would like to create 2 dual sono's for my living room. I have 2 SVS 25-31cs+'s running off a Sampson in my dedicated HT. I would like equal output although I heard that if done right then can sound like 2 Ultra's. If this is the case I'll move the SVS's to the living room. Any suggestions on volume/port size/port length. If you know of any good web pages for example/research purposes please post them.