Based on your explanation:
Quote:
The only time it crackels is when the engine or battery is turned off
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I would take a look at how the radio accessory lead is wired. You could get speaker crackle if the radio accessory leads are not matched correctly to boats accessory power connector. A sure sign this is the case is if you have to reset the clock and radio stations every time you turn the radio on. Let us know how you make out!