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Try to listen to your own CDs on your car and another (2009) S5 with B&O. I did this and there was an amazing difference (very bad versus ok) and they replaced sub and amp and now mine is ok too (7,5 on a scale of 10, the Bose in my previous S4 scored 8 and the AM Premium Alpine system scores 9, not bad for a factory system).
 
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