When I set up my rig the M82 envelope gives out a hell loud pop the first time I engage it. Why? What can I do about it? It doesn't do it at home with the practice amp even when it's been sitting around powered up for ages. First time at gig with rig it did it only on the first on/off cycle, not a major. Last night it kept it up for three cycles. It really didn't sound too good, specially for the tweeter so I'd like to get on top of it.