I've looking into a cheap sub and am seriously considering the Dayton DIY 10" for $350. Its gotten some good press. Now my mains right now are doing all the work set to "large". They're Paradigm Monitor 9v2's with a Freq response that stops at 45hz on axis and has a Low Freq Extension of 33hz. Now the Dayton says its useful up to about 30hz. My question is, is it even worth it to buy this sub right now? Besides freeing up some power in the receiver, what would this thing do for me?