How would you be able to tell the frequency?

Its in the lower range for sure mabey from 100-150, It may be around where the frequency hump in the M3 occurs...

I am going to run some more experiments before I do anything. I'll try the top M3 by itself, then the lower M3 by itself.

THe top M3 is mounted about 5 inches from the ceiling, so its in a corner, it may be enducing the frequency hump I am describing.

I also may try an M22 mounted up there too, to see if it has the same effect...

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