Car speaker problem

[DWBOX2000]

When I put the stereo on in my car, this loud, constant, static noise comes out of the back speakers and then eventually the noise vanishes and I can can hear the front speakers. What could cause that? Just wondering how To proceed.
Thanks

[stevej37]

How old are the speakers?
Pop the covers off and see if the foam surrounds are still there.

[masraum]

Does the noise occur every time you start the car for a short period or at random or...?

Can you give us some more specific detail about exactly what happens?

[Baz]

You're not playing a Mariah Carey Christmas CD are you?

[asphaltgambler]

Yes, give us a short description of what car, are speakers original, is there separate amp, etc.

[DWBOX2000]

Original speakers in 2002 996 4S.

When I turn on the loud, static noise comes from the back. It's constant for 10-15 seconds and then it dies down and then I can hear the front speakers. I can video and post that.

It was a known issue when I bought the car.

The owner was an 82 year old guy who must have enjoyed loud music.

Thank you.

[masraum]

I'm not a car audio tech, but to me what you're describing sounds like a problem with the head unit or amp, as if the rear channel isn't working correctly until it warms up or something like that.