Mine (blue dot) has no hiss unless I turn the trims and the volume all the way up, then I can hear it from about 6 inches. If I tried to play it that loud, however, I would destroy my equipment and my hearing. At reference level (very loud), with nothing playing, I can switch between inputs, both digital and analog, with no pops, and a VERY FAINT EAR TO TWEETER HISS. In other words, my blue dot is "empty morgue" quiet. When I first hooked it up, I had a hum in all speakers. I knew it was AC induced, and checked all my interconnects and my cable feed. When I went to unplug everything and begin the rerouting process, I unplugged one of my equalizers, and realized that I had failed to put a cheater plug on the end of a 3-prong power cord. I installed one and now there is nothing, and I mean nothing, coming out of my speakers that I don't want to hear.