Originally Posted by Five28
sometimes it's difficult to tell if there are sounds missing from specific speakers or if that is part of the music
I had a 540 of that generation, great car, awful
sound system, a BMW hallmark. In a meeting in Munich with their sound team, they wanted stereo sound for every passenger. I simply had to ask "you're the ultimate DRIVER's car, who really cares about the others, since trying to get sound for everyone inevitably by physics will lessen the sound for the driver?" Answer: "Well it's more of a challenge" which was not really an answer. Anyway back to YOUR system:
So FIRST, get your butt out of the drivers seat and maybe into the back leaning over the armrest, so your ears are in the MIDDLE of the car and the reflections are equal from both side. Then forget the music, for diagnostics play something like pink noise from YouTube. Move the fader forward, then left <--> right back and forth.
- This way you can tell if the sound is dead on the entire channel, or just in one driver.
If just the tweeter or just the woofer sounds dead compared to the other side, either the driver is bad or the wiring out of the crossover is bad.
Another simplest thing is to go swap the left and right RCA inputs on the amp, since it's right there, to see if suddenly the other side sounds dead, that would imply a problem in the amp or in the radio or cables feeding it. You can further switch front and back to see what happens.