Mate I'd just buy a inline noise filter. Albeit I got mine from the U.S., but I had the same issue although just on a TomTom playing MP3's.
Completely gone with the filter.
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Alpine 7909 30th/Alpine 5959/Audison Bitone.1/DLS Ultimate A6+A7/ Focal KRX2/Morel Ultimo 12/AudioEngine B1
A stereo that happens to have a XR5 wrapped around it
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