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I bought this ISO lead as I don't have the active system:
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https://www.dynamicsounds.co.uk/autolea ... o-mr2.html
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Since installing the headunit, my speakers have become crackly when I turn the volume up anything past 20.
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Before I changed the unit, I noticed that the earth was clipped to one of the mounting screws on the side of bronze coloured mounting brackets to go into the dash.
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![Think :-k](./images/smilies/eusa_think.gif)