You might want to consider a subwoofer. Sounds like the monitors are destined to live in the space behind a sofa. If you put a smallish sub (or two) back there, you'll lessen the (bass) load on your monitors and that will make your menu of potential options much larger. You'll also get great, extended bass if you do it right; and a sub-controller like the Velodyne SMS-1 will help that effort quite a bit..
I've used the tiny Sunfire CRMs with a sub very effectively in a similar set-up, in a similarly sized room.
Good Luck
Marty
I've used the tiny Sunfire CRMs with a sub very effectively in a similar set-up, in a similarly sized room.
Good Luck
Marty