Can you say textbook!

Freaking fantastic! Great schematics. We can probably agree that if your plan closely reflects the actual build, there is definitely a great wide dispersion pattern on the in ceiling M3s. I often wonder in my current layout if I used the front ceiling ATMOS locations with angled drivers, and the rears down firing, if I could get away with assigning them as wide channels. I have heard that wide with 2 overhead aids in the immersion moreso than 4 as overhead.

Have you tried this at all?