Subwoofer questions...
I have the Paradigm Studio 100 v3, mated with the cc-470 and adp 470s in a 5.1 configuration, and am using the HSU 1220 sub with the HSU 500 watt power amp. I'm thrilled with the configuration, as it sounds absolutely stunning, and feel certain it would work marvelously with your system, as well. It is extremely musical, and does reproduce extremely low signals, below 20 hz. I purchased the HSU based upon numerous user recommendations and review articles that highly praised the design and build of the HSU products. Plus, Dr. Hsu is available for e-mail correspondence, and will answer any of your questions.
In short, although I love my Paradigms, I highly recommend the HSU products, and recommend that you investigate HSU further.
Good Luck,
Pat Frye