Well. Does depend if your getting a humm or a hiss. We havent established that yet
Usually a hiss is a trademark of cheap amplifiers. However looking at your list of gear i dont see anything "cheap" there. Hum on the other hand is common with a grounding problem or physical transformer noise from the amps. not speakers.
Although Hums and hisses are both somewhat common with tubes depending on the individual tube itself. But you dont have any tubes i guess.
Dunno what to tell you really. If its not noticable from your listening seat. which I assume is farther back then 6 or 7 feet then i woudlnt worry about it.
