Haven't gone to check out the headunits. I'm most likely going with a Pioneer DEH80prs. I'm curious if anybody else has tested these headunits?
Interesting, did u try playing a low frequency tone for a minute or so? Like 200hzI picked up a new Pioneer MVH-X380BT off ebay for $50 usd. With a Nexus 5 with stock rooted Marshmallow the usb audio works perfect. No weird clicking or pauses at all. The only thing that sucks is that the head unit pushes out less power than the Pioneer DEH-P400UB it replaced. The volume on both decks goes to 62 and with my ipod classic over usb I could usually get it about 45-50 on the old one before it started to distort and clip and the new one goes to like 38-43.
I know using straight AUX from the device tremendously reduces sound quality due to the device acting as a crappy DAC, then sending the audio signal through the AUX to the unit.
But if it goes to a separate DAC then through AUX, i dont know. I would like to find out also
Conclusion: I suspect that there is either a fundamental problem with Android Open Accessory 2.0 that causes the clicking, or the stereo manufacturers are cutting corners somewhere, or maybe some incompatibility issue with the software. I just don't know. I tried to do more research but I have found nothing online about this specific issue.