I have ringing in my ears too, I have to stop taking my heart medication a few days before doing any serious listening-but I digress...

I've never heard any ringing in any of my five Axiom speakers, Three M3s and two M50s. Maybe the problem only exists on the M2,M22....(Oops, that's the ol' M50 Posse mentality coming through)

It sure seems on the surface that the problem lies in the electronics and not the speakers though.

Have you been using the 3805 for a long time or is it new to your current speaker set-up?(You may have said in a previous post, but I wouldn't know where to begin That kind of search) Agree, though, that plugging in a different receiver or even an old HTIB would help tie it down.