I just gave mine a listen at max volume. 100 on the C2300 and full gain on both amps - with no music playing. Couldn't really detect any "noise" until I hit 78 on the C2300. Gradually got a little more hiss as I went higher than 78. Though, I've never actually had the C2300 any higher than 60. At this volume it was causing the drainpipes outside to rattle.