Hello, I had a rehearsal on Saturday and after playing for 5 or more minutes, the cab was releasing a horrible stench (the smell of burned plastics). Rig I was using: A Hartke 3500, EQ flat, gain on tube and SS at noon, EQ practically flat (a little bit of boost on the 64 hz, 125hz, 250 hz (just onê, maybe two up)), Low pass Contour at 1 o'clock, High Pass at noon, volume at 10/11 o'clock. Speaker cable from 8 ohm output to a GK 212 MBE (rated 600 Watts at 8 ohm). I turned of the tweeter, and the stench went 'away' but still. Is there anybody who can tell me what the problem might have been/what the problem is? I didn't overpower the cab (head is rated at 250 Watts @ 8 ohm, so that should be allright), speaker cable is a cable that was made by a guitar tech. This is a picture of the cab I have (from the net): Any help would be appreciated.