That sucks man. Maybe send it back? We have a 2009 118 TSi which when stock has way better audio than our Tiguan Pacific 2012. I did the upgrade in both cars from an RCD 510 and both cars possibly have better sound now, definitely not worse.
Sometime I lose the rear speakers in the golf when i adjust the fader but that's fixed by resetting to factory sound settings. Have you tried that?
It should not be getting worse though, something's wrong.
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