I have owned a pair for about 5 or 6 years now and have integrated them with various speakers. These subs do what they do very well. They are more subtle than most subs you are probably used to. They do not move allot of air around and "load" a room like more robust subs do. All I know is, when they are in the system I hear the lowest frequencies that I don't otherwise hear, and it sounds like the corresponding instrument. A double bass in a jazz quartet has resonance, vibration and decay and when the subs are disengaged, the double bass isn't there anymore.
