Summary: I was replacing a Marantz SR7500 with this receiver! Audio quality is good. It seems to be driving a old Martin logan speakers (which are usually picky - needs good high power current amplifiers at 6 or 4 ohms to drive them). Denon 1508 is still not up to it and falls a little short. But I am not hearing any other extra noises/sounds/hisses from the amplifier. Cons: 1.