Don't bother. It's another audio sham. The only reason (I think) Axiom includes the capability is because some audiophiles expect and demand it. I'll let someone else fill in the details. And you will get other opinions.

The H/K and the M60s should be fine. Also, you should look closer to the higher end of your receiver spectrum (330), as the lower end H/K receivers lack some basic functions, such as changeable crossover settings.

I am the Doctor, and THIS... is my SPOON!