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Message: <blockquote data-quote="Jeff_hires" data-source="post: 8868605" data-attributes="member: 690671">It is not the phone's dac that's used in usb connection to a head unit. I found this good explanation on androicentral and confirmed on stackexchange."with Android Auto the sound output from the phone is purely a digital connection coming out from the USB-C that does indeed bypass your the DAC on the phone. It's just like plugging in an a USB stick with Mp3 files into a car USB port. It will force the system to use the embedded DAC in your car stereo system. Android Auto is also very heavy on the battery, hence the requirement to keep it Plugged in (USB-C is a multi-channel set that can charge & perform other functions as well). It also does use Bluetooth connections but not for music, only for voice calls and etc."</blockquote>

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