RB-1590 Stereo Power Amplifier Power - refined, detailed, and plenty of it. Rotel’s new Class AB stereo power amplifier is rated at 350 watts per channel into 8 ohms both channels driven. That is a lot of power, but larger listening rooms or less sensitive loudspeaker designs require it to bring out the best possible performance and attain realistic audio dynamics. But power unrefined has never been a Rotel design goal.