Currently, I have the sub that came with a Onkyo HTIB. 150 Watts/ 8inch. For the money, it sounds great to me. But I know that there is more out there. So, I went to Best Buy and ahhhh "rented" a sub for a few weeks. It was a sealed Klipsch, 12 inch, 250 watt I think. I expected a big difference. What I got was a little different, but not much. Any ideas why I hardly noticed anything? Maybe I am just to simple to notice much. I was thinking about getting the SVS-PB10 (the 20-39 is what I want, but that sub would cost me the house, custody of my children and force me to spend time with a lawyer). But if it isn't going to make that much of a difference to me, I won't bother.