Whoever is interested in subwoofers for his audiphile setup shall strongly consider "The Swarm" subwoofer system from Audiokinesis (or some simmilar setup of 3-4 small subwoofers). I'm using this kind of system (4 subwoofers) with Soundlab electrostatic speakers and I enjoy it so much. Previously I've used a single REL subwoofer with Quad speakers but the marriage was not realy good.