The title says it all. I added a JL Fathom F112 to my Paradigm Signature S2's this week (music only system) and I've never heard music sound better in my room. I have to admit I did not expect such a big improvement. Previously I had a Klipsch RW-12D, which I know, is not a top of the line sub. I used to think that 20-80 Hz is such a small part of our range of hearing it wouldn't be worth the investment for an expensive sub. Was I wrong! The JL goes so much lower I could not believe it, and the boom is gone! Love it! To top it all off, I snagged it for about half of retail! I have the volume up higher than is should be right now, but it's because I'm just stunned! I have a little tweaking to do yet, but I couldn't be happier. It's been one of the best investments in my system that I have made so far.