After a number of successful summer shows we hunkered down yesterday for a fresh jam. What came out of my speaker was the most frightening sound ever. A loud crackling, spitting DC distortion when ever I peaked out; not that loud, really. My Mesa EV loaded 1x15RR cab is awful durable and has never made this noise before.....I play heavy "free dub" and push quite a bit of bottom in the 30 hz range. So....is it my cab? Have I finally blown it? It worked fine at last weeks show. Is it my Mesa M-2000? have I blown some component or has a tube come loose or something? how do I tell? Don't blown speakers kind of "fart" or something? This was a real spattering, crackling electrical voltage straight outta the wall type sound! Very loud. What have I done!!???