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I doubt it, I think it's the BMW input stage that's the problem. For what it's worth, my AUX input isn't noisy and doesn't sound any worse than CD on the base stereo. My only real gripe about it is that it can't take a high input voltage, so plugging my phone into it gets me decent sound quality, but not enough volume because when I start to turn up the volume on my phone, then the system starts distorting. Same thing goes when I use an external BT receiver that plugs into the AUX. At the same time, plugging my phone or using the same BT receiver on other(home) systems yields good results.
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