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I would suspect that the unit is picking up ignition sparks possible from a lead flashing over. The voltage variations will be picked up by the antenna and comes through as a stop sound. Have it checked out at a radio shop
There are two speakers. Disconnect the one at the bottom that looks like a coin with glue on it. As far as I know it does nothing because the alarm and the radio go through the other speaker. Crackling noise solved.
If it's a wireless system, the circuits are drifting off frequency or could be picking up interference from just about anything. If not wireless, you probably have a part (transistor or chip) inside that is developing noise by itself.
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