yeah, so I sure did something to my M212. Haven't started taking it apart to isolate the issue, but I had the master up on one of my GK's and met with a good old vintage crackle in the pot as I adjusted the gain. That nice smell of magic smoke started coming off the cab a minute or two later... checked a few days later with another amp. Same thing. Something is fricaseed. I bought it used for peanuts, so it's no great tragedy. Near as I can tell, there is none of that blown driver buzz-on-the-decay-of-the-note that I've heard with other drivers that are done. Hoping it's just the x-over, which I'd be happy bypassing; not a tweeter guy. But I wanted to see what people knew about the drivers before I get to tinkering, since it certainly could be them. Are they proprietary? Custom Eminences? Or off-the-shelf drivers? Yes, I know that I could ask the company, but I haven't been in a German class since I was zwolf jahre alt.