Thanks to this sight, I learned about the famous SVS and had to have one. I received my SVS sub at the end of last week and was able to test the sub to its full potential this last weekend. This was my first REAL sub, if you want to call KLH a sub. My first impression was that it has tight low bass with no boominess. It also can get pretty loud without distortion.The bass also seems to open up after each session of play. I was under the impression that this sub could shake and rattle a few walls but that isn't the case. I feel that it is actually pretty tame in a sense. My den is 21" x "15" x 7.5". I do have one side that has steps that leads to the upper level kitchen area and is all open, so alot of sound is dispersed to that area. I have the gain about 2/3’s and the sub level about +8 in some of the action movies I’ve viewed and most music I have listened too. If I had the extra cash I would like to purchase another PB1-ISD and put on the other side of the corner. I believe that would be ideal in my setup. Overall I’m happy with my purchase. Thanks again SVS owners.