Originally Posted By: myrison
By the way, I meant ground screws... not plugs. They definitely work, so if you haven't tried those, start there. \:\)


I tried this, and unscrewing it eliminated the hum. When I had the hum with just the EP600, unscrewing the ground screw actually didn't cure it. The balanced cable did. I guess this time the problem wanted another solution.

In my little bit of experimenting, turning on the subsonic filter also eliminated the hum, as did setting the crossover all the way down to 40.