I recently had a e-mail exchange with Tom V. and like always, he was VERY helpful. He said in my room (13' X 13'6 X 9'), the 25-31PCi will give me 112-115 dB. and 20 Hz. - honestly, I don't know what this means! I have not had a real subwoofer Would 112-115 dB. be 'earth-shattering'? When I listen to music, it is rarly above 100 dB. at 1 meter on my Rat Shack meter. Thanks! If this is the case, I might order. I will be selling my JBL 4648A-8 (see below for explanations), JBL SVA1500's, and HLS Center and getting some Klipsch SF-3's and a SC-3, and a subwoofer. I am getting a 'special' 'deal' on the (new, legit) Klipsch's, so it is VERY worthwhile. *Explanation: I got the sub from the Tent Sale and got a PE plate amp - which I now realize never worked right, and then died. The sub is big and I want more low bass than anything else. I also bought a pair of JBL SVA1500's at a pawn shop for $300/pr. and those will go, too. Also, my JBL HLS Center will be sold. The only speakers I am keeping are my JBL HLS 610's which will preform surround duty for the time being.