I'm not sure we are comparing apples to apples.
M22-60Hz. vs M60-37Hz.
VP100-95Hz. vs VP150-85Hz.
QS4-100Hz. vs QS8-95Hz.
It's my understanding that you should match the +/- 3db rating as close as possible. If an exact match is not available then the next higher crossover freq. should be used. So for my application:
Main L/R = 60Hz.
Center = 100Hz. (95Hz. is not an option. 100Hz. is the next higher freq.)
Surrounds = 100Hz.
Am I going down the right path or am I missing something?
-Tom