for a long time i have been playing through my b2r into a 4ohm avatar cab without any problems. Recently I let my friend borrow my set up for a few shows. He doesn't know much about amps. At one of these shows where he was using my amp, I went to watch them play. He had my amp hooked up to another 1x15 cab. I was surprised that my amp didnt blow up. It was working good for a solid half of an hour except that that pretty much anything on the low E would sound like the speaker blew out because it made an ugly farting noise. I looked at the cab when i took it home and from the front it looked like everything was fine, there were no holes in the speakers. I dont know how to access the back of the cab to look at the magnets though. I haven't had the chance to try the amp out with the cab yet. Do you think that I will need a new head because it was running at too low of an ohmage than it requires, or do you think I will need a new cab, or would I need both? The amp turns on fine and everything above the E string sounds normal so I don't know what to expect..........???????