So...I was jamming with some friends yesterday and I think like I blew my new-to-me K120 -- exit sweet, sweet tone, enter razzy distortion.
I've isolated the distortion back to the speaker, so I guess my next step is to recone it. I've read the recone thread that's a few down from this one and will probably order one of the Sound Speaker Repair recone kits unless someone tells me something different.
I'm not sure if it was already damaged and I exacerbated it, or if I sent it some tones it just couldn't reproduce? I don't think I blew it out with volume -- although this was my first chance to play it at greater than bedroom volume levels, the Mesa TA-15 I was using puts out 25 watts on its highest setting, and I wasn't playing it that
loud -- my max volume was maybe 1:00 on the dial. I was
using my Maxon AF-9 envelope filter, which has a wide dynamic range, and (wild guess here) is it possible I damaged it with that, even though it wasn't putting out that much power? I was also using various overdrive pedals, but again, I didn't think I was pushing the speaker that hard. We weren't playing particularly loud.
I don't know how possible it is to do a root cause analysis on this sort of thing, but I'd like to learn what I can from this and move on.
Thanks for any insight/advice about either the cause or reconing the speaker.