I have the same issue in my F15 with the B&O. Ditto for bluetooth audio from my phone and screen mirroring. Maybe since they don't have control of the device's output level, they err on the side of caution when setting the gain level for such things...? Just a guess.
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2017 F15 xDrive50i M Sport | Superformance GT40 Roush 511 IR FE
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