Mark, I'm running the 60s with an H/K 635, ran them through the smaller Onkyo and yes the Rotels, to me, (and my wife) the sound is quite a bit more clear and crisp. We had the 60s at 100 db a little ago and the feel in the upper torso was complete bliss, the sound wasn't (again, to me) nearly as crisp and clear with H/K. But, for the difference in price and through the research I expected it to be better. I wasn't disappointed.
Most often for me it's overwhelming with all of the techincal details, but sometimes ignorance is bliss. I'm hearing a difference with nothing but my own pair of ears.