Rotel RB 1070 from Elite Receiver Big Difference?

The ONLY hangup with the RB-1070 is no factory 4ohm rating.
8ohm, sure and 'bridged' also, but no 4ohm rating.
It is 130x2@8 and (can't recall) 330 or 360 bridged/mono.

That being said, unless the Polks are really awful loads, you should be OK. The Rotel drove my Magnepan MG-1.6s quite well, except when going for sheer loudness and never ran too warm... The Maggies, while being 'current hogs' also are not a bad load, NEVER going below 4ohms and with moderate phase angles.

The RB-1080 is 200x2@8 and HAS factory 4ohm rating.

Maybe it is worth the extra (aprox)40% new?
2 further points.
What is the mininum impedence of the Polks?
Do you want to take a chance on having to do this twice?

What kind of sound would ATI be compared to Rotel and Elite?

I recently upgraded from the Rotel spearates to the Pioneer Elite receiver. I don't use it for music, just movies. In my system, to my ears, the Elite was just as good, and, perhaps, a bit more detailed, and a tad quieter. I would agree that the Rotel set up was warmer. The soundstage was a little wider but the Elite is definately more transparent. I am considering hooking up the Rotel 6 channel apm to the Elite pre-outs to see what it does, but not in a hurry as I'm pretty happy with it. The new audio codecs are simply amazing, which the Rotel gear, obviously, doesn't do. I think it's the RMB 1068 pre/pro.