[evilb]

I'm not sure I understand the purpose of this unless you're using a non-iPhone device. When using Lightning-to-USB from the iPhone, you're sending a true digital signal to the BMW unit and subsequently amplified by the B&O. This will be notably better sound quality than any re-amplified auxilliary output source IMHO.

Have you compared using the Dragonfly Red vs. streaming Bluetooth using high quality source material (e.g. 320kbps MP3 from Spotify or iPhone internal storage)?

Thanks,
Brad