Well, I owned a pair of Infinity IL120s subs and I used a PS-10 for a day. They are very good subs but not GREAT!
My best guess is it might be a good idea to look at a SVS 20-39PCi sub. It is about 2db louder then the SW-12 and has a hell of alot more extension. Now, the SW-12 is a very nice looking sub and will sound great but the SVS will have more performance. I say get the SW-12 if you can get it under $450 but if you can't, look at SVS.
Well, TomN from Sound & Vision magazine measured the CSW-10 only down to 29hz instead of 22hz. He also only got an average of 101db.
If $600 is your budget, I really recommend a SVS 20-39PCi. It is $599 with $25 for shipping. But if you really want to stay under $600, look at the SVS PB-10 for about $480 shipped. You could also look at HSU VTF-3 MKII, but I haven't used them before, just heard good things. I have used the Infinity and SVS and I really recommend the SVS for better performance.
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