I currently have the Def Tech SM 350’s temporarily up front as my mains. I am going to move them to the surround positions when I buy new mains. I have a question about a couple of different configurations I want to try. Here are the two config’s I am looking at: A. Def Tech PM 700’s as mains, no external sub (2 built in 250W, 8" subs) B. Def Tech SM 450’s as mains, Pro Sub 100TL (1 250W, 10" sub) My question is how much bass will I get from the 2, 8" subs vs. the 1, 10" sub? Also, does anybody know what type of effect elevating a sub off the floor does. I might put the PM700’s on 16" or 24" speaker stands. How does it effect bass output when a sub is off the ground. The Def Tech "email answer man" stated he thought I would get more bass out of the 2, 8" subs. While I respect his opinion, he also is a marketing man for Def Tech and may see a potential additional sub sale down the road. The low frequency response for the PS100TL is 19Hz and the PM700’s is 20Hz. So I don’t see much of a difference there. He also stated it is best to have matching mid/subwoofer sizes. The 350’s and 700’s match with 5.25"/8" respectively. The 450’s have 6.5"/10" respectively. Both have 1" tweeters. Any thoughts would be greatly appreciated.