jon
I have the same receiver.
One thing that I noticed.
I ran speaker wire throught the attic to a set of outdoor speakers on my back patio
When I run the A&B speakers together the output in the house is cut (A Side). So I have to remember to only run the A side only when I use the receiver in Surround.
So I am sure you have looked, but if the A&B speaker selector is switched to A&B then your power would be cut to the RF-7,s
Hope it is that easy
Greg