Perhaps you can describe what you are trying to achieve with this testing? The NAD is a solid unit, albeit without all the bells and whistles. I used a 7240 for years driving Axiom AX3's and later M80's with an EP350 to great joy.
If your trying to get the M22's and EP500 to work within the frequency ranges, I originally connected my 7240 to the High Pass inputs on the EP350 and then ran cables to the M80's. The sub acts like an AVR would by setting the limits on frequency passed to the downstream speakers.
This required extra cables, but worked well. Not sure if the newer subs still offer this capability.
