So I have an Eden 400 head and the eden 210 cabinet. Lately, I guess for the last 2 or 3 months, most of the time after turning the amp on, a loud pop comes out of the speakers. Not right after turning it on, usually after it warms up a bit. And it's loud too, makes me jump every time. Sounds fine still. I also use the 400 head with my buddies Ampeg 15 cab and never noticed a pop. Seemed like there was some sort of surge once but no pop. Anybody have any experience with this?