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My dealer told me today that the first upgrade (205 W) is to have the sound coming from more corners in the cabin. If I want the best sound quality available today the 600 W upgrade is recommended.
It also seems that the quality of the 600 W HiFi depends on the size of the cabin: it is better in a 3 or 5 series than in an X3/X5 because the sound dispersion rate is much higher in the SAV's.
So I will probably order the 600 W upgrade and hope for the best !
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