I did M22's sitting on M80's if it helps. For a short time I even tried M3's sitting on M80's and M3's sitting on M50's.

To be honest, I didn't think it did much and I thought it sounded odd. The M3's sound nothing like the M80's so that was a bad idea all the way around. The M22's however are much closer but like I said, I didn't like it all. I think Axioms are a little "forward" now, and with M22's on top of M80's it was a little too much for me.

The M50's and the M3's however worked really well together. Very nice blend between the two.

Why, what are you thinking of doing? Trying to run them together or off different channels?