Did I blow a speaker or not?
Sounds like I blew a speaker. I turn the volume up too high, and one of the rear speakers gives that awful blown speaker sound. But, the speaker cones aren't torn anywhere.
The next day, the blown speaker noise stopped. Last week, it came back and a rode a couple miles with me, then vanished. Now, everything sounds fine again.
Wiring looks the same as always, and not corroded. The other three speakers aren't having problems. I'm confused. Is my speaker dead, alive, or Schrödinger'* cat?