Used tested working out of both channels.I think I read this at being 275 watts per channel at 8 ohm.Dents scratches look at pics.Did not test in bridge mode.Pots need detoxing because of static.I don't hear any humming coming from the output but if you are the winner you should have it checked out make sure the caps aren't leaking being so old and for long time safety.Selling as is.as stated. No refunds