Question about 1990 Cadillac Fleetwood

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Speakers make high pitched noise

The rear speakers in my '90 Cadillac Fleetwood only make a high pitched noise, while the front ones seem to work. Why is this happening?
The RPM of the engine makes no difference in the loudness, it seems to be random. Would this have to do with grounding or possibly blown speakers?

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Car Radio Battery Constant 12v+ Wire: OrangeCar Radio Accessory Switched 12v+ Wire: YellowCar Radio Ground Wire: BlackCar Radio Illumination Wire: GrayCar Stereo Dimmer Wire: BrownCar Stereo Antenna Trigger Wire: PinkCar Stereo Amp Trigger Wire: N/ACar Stereo Amplifier Location: N/ACar Audio Front Speakers Size: 5 1/4" SpeakersCar Audio Front Speakers Location: DoorsLeft Front Speaker Positive Wire (+): TanLeft Front Speaker Negative Wire (-): GrayRight Front Speaker Positive Wire (+): Light GreenRight Front Speaker Negative Wire (-): Dark GreenCar Audio Rear Speakers Size: 6" x 9" SpeakersCar Audio Rear Speakers Location: Rear DeckLeft Rear Speaker Positive Wire (+): BrownLeft Rear Speaker Negative Wire (-): YellowRight Rear Speaker Positive Wire (+): Dark BlueRight Rear Speaker Negative Wire (-): Light Blue

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Car Radio Illumination Wire: Gray
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1994 Cadillac Deville Sedan Car Radio Wiring Guide

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