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I just wanted to let everyone know that we have two 2012 X1s. One has the professional system (standard) and the other has the Harmon system. When I listened to both system side by side, the Harmon system is better for sure, in terms of clarity, bass, treble sound reproduction. I would say that it's about 25% better sound overall, and it also has the equalizer built-in the iDrive menu. However, I will also say that the standard system is already quite good, and most people would be happy with the base unit.
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