Rig: Sunn 1200s rack amp, 1200w @ 2ohms, solid state 40hz slider all th way down, slight bump @ 60 and 120hz, compression on, limiter at the front of my effects chain. Sunn 215BH with Eminence Kappa 15LFAs, 600w RMS x2 = 1200w, two 8 ohm speakers @ 4ohm load. Ampeg 810E, 800w rms. Bass is tuned to CGCF. I managed to fry two EV DL15w's I installed in the cabinet before, and a Yamaha SW118. I just installed the Kappa 15LFAs, and within three minutes I smelled smoke and turned off the amp. I tried a JBL 215 PA cabinet and smelled the same smoke. What's really strange is the 810 doesn't suffer any problems when run either solo or with any of the other cabs. I tested both cabs with a multimeter and got readings of around 3.5, so each is pulling 4 ohms. My tech doesn't know what's up and neither do I. Why would the head fry any cabinet except for the 810E? I've tried different speakers cables and different outputs on the head. ???