Just took delivery of a b stock SVS 2039 PC Plus. I had been using a dayton 10" from parts express which was not bad at all. So, I hook up this new big black cylinder, and like a good doobie, I calibrate before doing anything else. Finally get it fired up and start looking for some demo material. At first, I'm thinking okay this does not seem that much different than my dayton. And then....we hit a hot spot in what we were listening to and bammmmmmmmm and booommmmm. I could feel this wave of sound that I had never felt before go through me and my chair. It's actually kind of scary the first time you feel it. Maybe we humans are hard wired to have a viceral reaction to big rumbling sounds... I think bass like this somehow taps into our emotions somehow. Anyway that's my initial impression. I have to find more good demo materials and I'll probably start with the usual suspects. I'm looking forward to getting to know this beast of a subwoofer. I'm in a condo right now, so I can't take full advantage of its power, but I'll be moving into a house soon and then I'll get to really try this thing. I'm glad I bought earthquake insurance because I think that I may need it. My only question / complaint. Wasn't I supposed to get a t-shirt with this thing (I was actually looking forward to wearing and explaining to people what it means) I did get a pen, but that's not as much fun!!