Summary: It runs on 45 amps. Simply put this is the number you should be looking at. Other receivers at higher price points run less amps compensating with more watts. I auditioned an Onkyo (36 amps I think & 105 watts/channel) with the HK AVR500 (45 amps & 80 watts/channel). At the same volume level, the HK blows away the competition with rich, full sound. The pros outweigh any of the cons with this unit.
Summary: The AVR 500 Is The First Popularly Priced Receiver To Feature Harman Kardon's Exclusive Logic 7 And VMAx Surround-Sound Modes Along With Dolby Digital And DTS. With S-Video Switching, On Screen Graphics And A Powerful Harman Kardon Amplifier, This Is The Perfect Receiver For The Discerning Music Lover's Home Cinema... Specifications...Amplifier Section..
Summary: I have owned this reciever for 6mo and love the quality of sound it produces. It performes equally well in both stereo and cinema modes. my reciever was one of the early serial numbers so I have had to have the volume control replaced, eratic volume control was a problem on the first AVR500's. This reciever is very flexible with many analog, digital, coax, and s-video plugs.