I recently went with an external amp to test out the differences between receiver power compared to external. So far my findings have been extremely positive but since I am fairly new to this I was curious what is acceptable floor noise when using external amps. If I have the volume half way up and mute the sound I can hear hiss about a foot away between my speaker and ear. What are you seeing with your external amps? I just don't know what is the acceptable standard when it comes to floor noise. I'm using RCA connections from a Marantz SR7010. Thanks