I've got a pair of Velodyne DD-15s that I'm using with the DSP5200s that I'm quite pleased with. I'm getting clean response into the 15Hz range which works out well for movies.

Not needed so much for most music materal though wink

Best,

Surround Music Fan/Computer Geek/Curmudgeon in training.
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861v4, HD621, Panasonic BD-P55K, Toshiba HD-A35, Oppo HD990, Dish Network 622, Pioneer DV-668AV-S w/ DVD Upgrades mod, EW Fontaine II (x5), Velodyne DD-15 (x2), Seymour AV Ice blocks (x7)