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I just took delivery of a BMW 535d SE F10 during November 2010, great car, let down by very poor standard speakers. Dealer quoted three times factory-fit charge to upgrade to HiFi Professional (factory fit is about £700). Does anyone know if I need to change the amplifier and stick with the standard 6 speakers, change only the speakers, or change both amplifier and speakers? Can anyone recommend a good fitter who won't ruin the car in upgrading and can do at a reasonable price?
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