Isnt the crossover in a three way speaker designed with a minimum distance for proper summing and baffle/boundary compensation? I'm not sure m5hps are the answer for a desktop. I think most 3 ways are designed for 2m plus listening distance. I'm not sure.
I would suggest to fosterco to EQ the bass down on the M3s instead of putting a bump into the midrange. Just a couple db. Chances are reducing th bass and consequently any room overhang will improve perceived midrange clarity. Play around and let us know what you find out.
