curtis,
I have a H/K 380i stereo receiver that i use in my home office to drive some Tannoy Revolutions. I have not hooked it up to my Axioms but just out of curiousity, i might give that a try this weekend.
Maybe it is possible that H/K and Rotel use some kind of low level filter somewhere in the internal chain.
It's another thought.

"Those who preach the myths of audio are ignorant of truth."