David: I can't imagine needing a second sub or ever feeling the need to upgrade to improve the low end of my system.
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I said 3 years ago when I got the PC+ ..

Thanks for the comments though.

------ M80, VP150, QS8 Surr, QS8 Back Surr Sunfire Amp -M80, Denon 3805 -all else, SVS 20-39 PC+