I figured that feeding signal to the pair of binding posts from a single amp wouldn't be the same as it would be if the processor had twin outputs with cross-over control for each output.
So, I picked up some solid core hookup wire and made some jumpers (stranded wire spread when the binding posts were tightened.)
What is really interesting is that before jumpers I was listening to a pair of super M22s with twin tweeters. Sounded very good.
Needless to say, with all drivers working, the sound quality is much better. I had to reduce the EP500's cross-over point and volume.
I watched a bit of Transformers. Didn't only shake my house.
Heard from my very nice neighbors for the first time.