That's it, totally what happened, my volume was nowhere near super loud, a bit above bedroom level. When it occurred it grew louder very quickly, I couldn't get to the foot controller fast enough to stop it in time. I will not be using Multi Delay again till they fix whatever caused this. Oh well, gave me the push I needed to get some Delta Pro 12 A's. BTW, my amp is a Matrix GT1000fx, speaker cab was rated at 100 watts and the amp was running stereo, ohms don't matter that much on this rig due to the matrix amp, my other cab had JBL G125-8's in it and handled the incident without damage, but the two celestions, died quickly. I would have been VERY mad if my JBL's had fried, those are impossible to get now, they are like EV12L's, and really pretty much extinct too.