F/R speaker sounds like its piping in supercharger whine.

[Chinampa]

Im pretty sure its not supposed to do this. Its an OEM speaker if that helps.

[StereoInstaller1]

Speakers do as they are told, whatever runs that speaker has the issue.

[matthugie]

I've had that issue with a bad ground.

[IRON-E]

I've had that issue with a bad ground.

^^^that's it.

[Chinampa]

I guess I've got some rooting around in the footwell to do then

[StereoInstaller1]

You need to start by looking at your wiring behind the radio, and I don't think you mentioned what all you had installed in the system.

[BudCrow]

My front right doesn't make any sound at all. Wish I knew why...

[StereoInstaller1]

If you are having issues, post a thread with year and model along with exactly what gear is in the car. R3V has fixed hundreds of crappy installs, we can help you fix yours too.