Recently picked up a rotel RB991 second hand which was in showroom condition. Just a little while I hooked up to my RTI 12's Fronts and just compared them to my normal connection of my denon(not bi-wired). at -16 db there was no diff(not to my ears anyways, or two of my friends). To be honest I did not find much different between normal or bi amp to the rotel. I wouldn't turn it up to high as i didn't want to damage my speakers about 75%of max volume. Check all connections everything looked good, had the rotel set to unbalanced, using high quailty rca cables(Monster Cable Ultra 800 RCA Stereo) and 12 guage speaker wire. Anything I missed? The guy told me the amp was hardly used, could there be anything wrong, or maybe my ears are gone lol. Anyway thinking of just getting ride of the amp as my denon seems to do a fine job without it. Anybody with any experience with this setup would love to hear your opion.