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?
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?