I would like some expert opinions to adding more subwoofers to my system. My room is somewhat of a challenge acoustically but what I have sounds pretty darn good so far. What I am trying to accomplish is filling the room with better/more bass. See my room layout. Scale is 1 square = 1 foot. Front speakers are Paradigm Signature S2's, center channel is Paradigm CC-490, surrounds are Paradigm Studio 20 V5 and sub is REL T-9. To further describe the room, behind the sofa is all mirror, to the left of the sofa is floor to ceiling wall to wall glass covered with vinyl vertical blinds closed anytime music or movies are playing, behind the TV is flat wall, fireplace is covered with textured rock and to the right of the sofa is open to the rest of the room. Ceiling height in the living room is 10 ft and rest of the condo 8 ft. The speaker placement is pretty good working around the rooms characteristics but the sub is what I'm working on. The REL T-9 is in the corner behind the television and front left speaker provides some really nice bass. It fills the room nicely. What I want to accomplish is more even bass throughout the room. My thought is to add another REL T-9 and locate them on either side next to the sofa and add another higher output sub behind the television and left front speaker to output lower frequency information. Using the high level connection on the REL for L&R channels will provide the musical blend for sure and low level for LFE gives the extra for HT. With the aid of a higher output sub behind the television and left front speaker it would be the icing on the cake I believe. Thought about using a REL R-528 for this since it could be connected the same way using the high level and LFE connections. I really love the musicality of the T-9 and for HT it does a nice job so I think complimenting it with a twin, moving them either side of the sofa and something higher output opposite behind the left front speaker would be complete. My thinking is using the same manufacturers product things would blend easier and better than mixing and matching. Otherwise I would only use a different brand for the behind the television (higher output) sub. I have read hundreds of reviews and toyed with ideas like the Paradigm Seismic 110 which I have auditioned and wow does it put out some punch! Another to consider are the Rythmik F15HP. They really make a beautiful piece of furniture and they spec out impressively! I need some opinions since this decision is an expensive one and I'd rather do it rite the first time cause selling and rebuying gets expensive!!! Comments please???