You do not want to bridge a RB-1070 and try to run a 4 ohm load. The bridge on the RB-1070 can only be run in a 8ohm load AND will produce a bit more distortion. Unbridged, the RB-107 can run a 4 ohm load, but wil get warm/hot to the touch so allow plenty of air flow.
Rotel RB 1070 from Elite Receiver Big Difference?
I'm planning on a new set of speakers (Posiibly Polk LSi9's) that will require 4 ohm amp. My Pioneer Elite receiver (43tx) only rated for 6ohm or higher. Although the Pioneer sounds good (very neutral--which is its job), I'm thinking of Rotel RB 1070 to drive fronts (then I can upgrade speakers). I hear Rotel sounds a touch warmer than Pioneer? If this is so...that would be perfect. Anyway, I'm hoping the Rotel amp would be an improvement or as good as the Elite amp. Opinions?