Pulled an NYAL Minuet in A preamp out of storage where it was for over a decade and installed it in my system. I remembered that it had some issue with one of its channels. It was a Saturday morning and I turned it and the system and went to the kitchen to make coffee. This preamp has a 45 second turn on delay for the circuit to settle in and it can output something like 30 volts(it could run a mile of interconnect cable). I thought that I turned the balance control all the way to the right channel but in fact, turned the volume control all the way to the right (UP!) waiting for NPR radio to come on, and boy did it come on. I nearly pi##ed myself moving as quick as I could to turn it down, but alas, it took out both mid/bass drivers in my speakers that have not been manufactured for a while. It wasn't until later, after purchasing new speakers that I found out about Bill LeGall and Millersound who was able to rewind the voicecoils and whatever else needed to be done.
So if you do a "Stupid" as I did and need the impossible done, at least with speaker drivers, this(Millersound) is "The Place" to have them made right again.