HSU VTF-2. Read reviews on www.hsuresearch.com and one addresses your very speakers in combo with a VTF-2. I own one with Soliloquy 5.0s and love the combo.
REL Stratus III or Storm III. Easy to integrate with just about any speaker, and since they do not use a crossover, they let your favorite main speakers play full range. You'll continue to enjoy the sound you are use to and more.
I second that motion, Sugarbrie. My REL Strata III integrates seamlessly with my mains and so does my friends Storm III. The most "musical" sub I have heard yet, excepting the $5000 Aeriel sub.
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