Can't help on your query but what Xtrons unit have you got? I'm looking for and Android Auto double din for my Volvo but don't like the sound of the background noise problem.
PB78ATTRP
I don't think you'll have a noise problem, people who have Audi's without Bose don't have this issue, it's a problem in the way it interfaces with the Bose amp.
However, the sound quality, even without noise won't be on par with Pioneer/Kenwood etc, the Xtrons doesn't use high quality audio components. The screen and functionality is excellent though, but everytime Xtrons make new units, it always seems to be a focus on more speed and more pixels, and never better sound, which seems bizarre to me for a headunit, but maybe it's expensive to increase audio quality compared to just putting a nicer screen on it. Split screen Spotify/Google maps is great though.
This is why I'm trying to do what I'm doing, using the Xtrons as the display, but routing the audio through a better quality Pioneer unit.
Don't be sucked in by Dynavin. You'd think they're twice the price for a reason, but they're just as bad as the Chinese Android offerings.