Subwoofers - 1 Martin Logan Depth or 2 Grottos?

The 2WQ, as you have already stated, will not work with your current set-up.

THe Grotto (while very good) is not really in the same league as the Depth. What ML calls Balanced Force Tech is really just a way of cancelling out cabinet resonances. It works.

If your room and set-up is not symetrical you would benefit little from stereo subwoofers. You may find that two subs do sound good but not as STEREO subs.

Room placement is important so demo it with a 10 meter interconnect to see if the couple of livable places it can go will allow it to sound good. The Depth is the most tweakable in the ML line (more so than the Descent even) and small enough to be less obtrusive than the average sub.

A sub that is not integrated well with the speakers is just a bass box banging away in the corner (no mater how $$$ it is).

Good luck!

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

Thank you all for your help. I wish you all the highest fidelity.