yep, thanks Mike, have used those before in bigger applications...
The good news is I worked things out, thanks Ian! The placement of the "ground screw" sticker was closer to a different bolt which was the incorrect one. I had been trying to remove the wrong one.
I thought it was strange as the original amp that came with the ep600 was a phillips. Well, it turned out a bit further away is another phillips head screw which is actually the ground.
I will be testing tonight to see if the hum in the other speakers has vanished... thanks all
