I was thinking to get them matched to each other which shouldn’t be too hard since they are basically in the same spot, and then use the minidsp to adjust them together.Don't know. If it were me, I would first verify that stacking subs produces an improved response using REW measurements. In my experience, stacking subs is not a good idea. I have two co-located subs, but I place them side-by-side. And I gain match them individually. Actually, I don't know how you would treat two subs as one when gain matching. They have individual gain controls.
I guess I gotta play around with it some. I will definitely check the responses though to make sure I’m not hurting anything by stacking them. That didn’t occur to me And it’s Not a big deal if I go back to one in that corner