High pitched noise and smoke from speaker...
First of all I should say that all the information I have is from word of mouth.
Passive speaker driven by amp (which is almost always left on) started to make a high pitched noise and 'smoke' 10 minutes after turning the computer on and swithing the mixer to this signal. It was switched off at wall by passer by and ever since I've not been able to recreate it. Speaker looks and sounds fine! Any thoughts on what may have caused this 'smoke'? Should I just leave it? I should mention that although we do have a lecturn mic that was turned on at the same time, it is again almost always on and ive never created feedback from it, even cranked up really high. Also it was only one speaker 'smoking', the other was fine.