Thought I should update this.
The centre speaker was borked and a replacement at £57 made a huge difference to both the sound quality overall and the phone output. one plastic trim cover, 6 x 8mm bolts for the surround under that carrier and 3 torx bolts for the speaker itself.
Sorted!
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1988 Audi 90 2.2E
2011 Mercedes E250
2016 Abarth 595 Competizione
2012 Porsche 981 3.4S PDK mid life crisis!
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