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      12-17-2012, 03:05 PM   #4
Grovsnus
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Drives: Le Mans blue X1 35i
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From what I've heard and read, the Harman Kardon does improve treble quite a bit over the US standard "HiFi" option, but has a somewhat thumpy bass and doesn't do all that much for improving midrange.
But both the HiFi and Harman Kardon options are supposedly way better than the European default, "standard".
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