Musical Subwoofer for 2-channel system

Lets throw in there the MJ Acoustic subwoofers. I currently use there 100 MKII in my living room with seamless integration thanks to it wireless remote. Plus it has a variable phase adjustment making set-up more of a breeze. The most musical sub IMO under a grand.

A used Rel Strata fits your criteria: very musical, easily blended and low and high inputs.

I've narrowed my search to either 2 JL Audio F113 Fathoms or two Velodyne DD 18s. I still haven't decided. Can anyone offer some help?

I excited about the JL Audio for all the great press I've seen lately. I've noticed it is used in several members systems.

The Velodyne's setup routine sounds like it is superior to all others.

The Velodynes' also has a servo mechanism, I'm wondering how effective it is and if this makes it superior to all other subs?

Again I will only be using this in a two channel system for music only.
Please help me decide.
It would be great if anyone knows how to contact Larry Greenhill from Stereophile? He has reviewed and reportedly owned both subs, so I'd love for him to respond.

Thanks,
Steven