I would calibrate them independently and just see how well they match up. If you have the M22 co-located you should see a bump in there output. The VP 150 is a bit more sensitive and will draw a bit more from the amp but as I see it the difference should be very minimal with the M22s set up the way you have them.

Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud