I recently added an SVS 20-39cs to my Heresy's and I couldn't be more pleased with it's performance with music. I was afraid the tight midbass of the Heresy's would be covered up by the addition of a subwoofer but the SVS has proven to be a fantastic match. Tight and accurate with no resonance or sloppiness whatsoever.
See my review over on the HTF
Another Satisfied SVS Owner
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--Elliott--