An array that looks like this

o
o
o
o.
o.
o.
o.
o. 0
o. 0
o 0
o 0
o 0 BIG O(sub woofer)

Where the odots are tweeters, the small o' are mids, and the right O's are woofs, isn't an MTM. And the 0's are in a separate ARRAY altogether

So I'm not sure what you mean when you invoke Joe's MTM

Can you clarify?