Has anyone had "ringing" with multiple RGPC units?

WOW......someone finally responded to my question - Thanks! After much experimentation and after having the same experience with a second system I put together in my study (two channel only), I determined that the "ringing" I was hearing was actually an increase in microdynamics, coupled with a closely miked recording. In other words, the units were just doing their job, and quite well I might add.

As far as why I bought a 1200 is concerned, I got a very good deal on it, paying close to the price of two 400's, plus it looks nice and I can put it in my equipment rack.

Thanks again for taking the time to respond.

I auditioned the 1200C and did not hear any ringing but here's
some info: Why pay so much more for the 1200C when all it is
is two 400's wired parallel? So I have two 400's in a daisy chain config which got better results and saved a lot of $$$.