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Yep, same crisp sound on my car as well. Overall Im satisfied, but I thought that the sound will be clearer, it gets better on a high volume tho..
I had a system with an amplifier and basic speakers, upgraded to harman kardon twitters and front doors speakers and having this sound issue only when using Bluetooth or not playing music while connected via Bluetooth.
Went to BMW dealership and they said that's a known issue (when they do systems upgrades to customers).
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