Svs subs is nice. I would add Rythmik sub into the mix. You could try minidsp 2x4, antimode 8033 (or 2.0 if you have extra money)or behringer BFD DSP-1124P for a full system control. Here are some usefull links
http://www.hometheatershack.com/forums/bfdguide/
http://www.hifizine.com/2010/09/subwoofer-equalization-and-integration-with-the-minidsp-2x4/
http://www.dspeaker.com/en/support/faq.shtml
http://www.hometheatershack.com/forums/bfdguide/
http://www.hifizine.com/2010/09/subwoofer-equalization-and-integration-with-the-minidsp-2x4/
http://www.dspeaker.com/en/support/faq.shtml