Hey guys, I have a Mesa Boogie M-Pulse 600 head and Avatar cabs (4x10 and 1x15). When I went to band practice and plugged in yesterday, my amp sounded exactly like a guitar amp does when it's not grounded (like when you have to put your hand on the strings to stop the buzzing). The sound seemed to come from the center of the 4x10 cab. I've since tried the amp in a bunch of different outlets but I get the same buzzing noise everywhere. Anyone have a similar experience? I called the local amp repairman, but he's out of town for now The amp sounds like I can still use it, but I don't want to risk it...but im dying to play bass. Thanks.