I know there's a few home audio buffs in here that can help me out. I'm looking for some good bass extension and I think a subwoofer will really help me out. I'm currently using JBL S38s (Studio series 3-way bookshelf with 8" woofer) as my mains (they're awesome for the price I paid- $300/pair). My budget is <$600. My biggest problem is that the room is very large- about 8000 cubic feet (about 40x20x10, carpeted floor, hard walls). I get good sound from the JBLs, but I'd like a little more bass. The setup is only for parties/music- no home theater, but it'd be nice if the sub works there too, if I decide to change things around in a smaller room. Do any of you have any suggestions? I'm currently looking at the Infinity PS12 (12", 300 watt RMS).