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    Buzz / whine from speakers - aftermarket HU

    Afternoon, I've got a 52 plate audi s3 which when bought had an aftermarket HU fitted (Kenwood KDC-237), non-bose with sub (no amp) in boot. This clearly wasn't fitted properly as I have a dim buzzing/whining noise coming from the rear speakers which gets louder/softer with the revs of the...