Ockham
I had a CHT10 as well. Great sub!! Velodyne does subs very well. I'd look for a used CHT10, buy it and use a twin sub set up. If you have an SACD or DVD Audio player, I'd get a B Stock Outlaw ICBM bass management unit with stereo sub outs and run a pair of Velos out of the Outlaw. You'll also protect your speakers with the ICBM because most receivers do not provide bass management in multichannel direct mode.

Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.