Re: Stock speaker problems
2008 XR left front speaker on again off-again, RR speaker ok, and both front tweeters ok, real tinny sound.
These probably failed between 90,000 and 100,000 miles(now).
You can test by using fade & left/right controls when you press middle of tuning knob.
Since I had replaced all 4 Saturn 2007 Aura speakers, I took a wild guess that the QA dept at GM hadn't caught up with the likely fatigue issue on the voice coil electrical connections, all speakers measured open circuit. No apparent damage, looked fine (pretty weak magnet, but probably normal), just no continuity through voice coil.
Front speakers are 4 ohm and rears are 8 ohm. Very glad still not wiring harness problems, speakers are pretty cheap as they go, but stock units gave, and new stock ones from GM still working fine & sounding good on Aura 155,000 miles.