Hi there I'm having trouble with my Sunn 300T. I was getting farting noises and I'd thought I'd blown the horn in my Eden 410XLT, so I unhooked it altogether but it has made no difference. I've changed all my leads and the cab also seems fine with my borrowed Hartke HA5000. So I think I've singled out the Sunn as the problem. The distortion sounds like excessive fret buzz and is most prominent from the open A up to the D (5th ft). Whats bizzare though is that last night at the gig whenever the drummer hit his kick drum (only when the large drum fill was switched on), the cab farted. Even when my bass (stingray 5) was unplugged. What the? Does anyone have any ideas??