Another vote for REL and also to swarm subs.
REL subs are truly tuned differently...they seem to add a lot of space and air to the signal and aren't just about thump. They are also very fast.
Swarming has helped eliminate bass nodes.
Comparison of various subwoofers for 2 channel audio
I have a 2 channel audio system, and I appreciate how subwoofers have augmented the sound quality of my system (with electrostatic speakers). I currently am using a pair of Martin Logan Balanced Force 212 subwoofers, but I’m thinking about adding more subwoofers for a total of four in order to help balance the low frequency sound waves. I’m considering adding a pair of Rythmik, SVS, or perhaps Velodyne subwoofers to the system. Does anyone have experience with many of those brands, and how well they integrate with electrostatic speakers in a 2 channel system, or perhaps should I just get a second pair custom built with certain specifications?
Thanks.