Subwoofers - 1 Martin Logan Depth or 2 Grottos?


A previous call for help narrowed my search for a musical 2-channel quality subwoofer - thanks all. First choice was Vandersteen 2WQ but my stupid (albeit sweet sounding) integrated amp does not have power inputs. So forget Vandy. Second choice is Martin Logan Depth. But I was wondering if two Grottos would be better than one Depth? Depth has BalanceForce technology for tightest bass. Grottos do not but two may offer better stereo imaging. Not sure which evil to neutralize.

Current system:
Amp - Opera Audio Consonance a120 Hybrid Integrated (90 wpc)
CD Player - Opera Audio Reference 2.2
Speakers - EgglestonWorks Fontaines
rockadanny
I agree with the Nerd. Also, someone here on AgoN had a really nifty way of locating a good spot for (I guess one) sub:

Put the sub at your listening position and play some music with a range of bass, and walk around the room to find a spot(s) where the bass response is flat. That (those) is/are the best place(s) for your sub.
I would suggest that you forget the Depth and go with the Descent, which at a K more will solve your bass needs much better than the Depth. I have tried both, and I much preferred the Descent.
Happy Listening,
JWALKER