So you're leaning towards ground loop hum? Might start here https:\/\/www.audioholics.com\/home-theater-connection\/ground-loops-eliminating-system-hum-and-buzz\n\nThank you for this. \n\nNot sure what you call this or what's happening but I isolated the problem.... I disconnected the trigger and the buzz went away. The only thing is, I would like to use the trigger. \n\nIs it something wrong with the amp or what am I doing wrong?