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2012-2013 BMW M5s had 3 audio systems:
1) BMW Business (BMW Standard Audio) - Alpine - standard
2) BMW Professional (BMW Premium Audio in US) - Harman Kardon Logic 7 - standard in North America but optional in some other markets
3) Bang and Olufsen
In 2014 they renamed BMW Professional as Harman Kardon Logic 7 and added Harman Kardon labels to the speakers. We don't know why they made this change, but one might speculate that two factors may have influenced the decision:
1) With the intro of Bang and Olufsen, BMW were no longer embarassed by the notion that their premium audio option was the mass market Harman Kardan brand also seen in Chevys
2) People who were paying $900 for the BMW Professional option couldn't visually see the difference between their speakers and the base speakers and were demanding some sort of branding.
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