I did use the proper compensation, with padding. You are right about "something like electronic "CD" eq is needed" in your other post. Rane lists the cap values needed for this & the unit is simple to modify. I understand that "CD" compensation is different that what Wayne uses. The jumper is just for a cap, and I am not able to tell what else is in the circuit. I assume there is some padding or slope to it. It may be possible to add another item to this circuit in the Rane to get Pi friendly compensation. Any ideas? I am still interested in making this work for a PA I am building for my brother.

Interresting stuff about Adcom vs. Rane. I have the older unit with unbalanced outs to the amps, but the inputs say bal./unbal. (tip ring sleeve) I suspect It is really balanced with unbalanced being less than optimal. So you may have a point on the input side. I was not aware of DC offset issues with rane gear, I guess that is good to know. (even if It's bad news) Thanks for the input.
Thomas