Subwoofer suggestions


I have a pair of Pioneer S-1ex's , now looking to add a sub.  Room size is 12x18 fairly well damped.  
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+1 rocray.  I have an SVS SB2000.  It's a sealed box design and not too big, and it reaches down to an honest 20Hz and feels every bit of it when called for.  For $700 I think it's a bargain, but I haven't compared it to the others, which are also excellent.  Best of luck.