If you look at the specs its no contest in in favour of the EP600 , though there is a big price difference. The better comparison would be the top of the line SVS Ultra sub and the EP500 which are closer in price and performance. However in listening tests the consensus was tilted to the EP500 because of its superior articulation and excellent DSP controlled frequency response. Though the SVS sub had better extension down low it has inferior performance in the mid/high bass.
SVS has a new line of subs on the way slated for later this year and its expected that their new subs will be much more competitive, performance wise with the Hsu and Axiom subs. If you want an SVS sub you should wait for the new crop.
