Quote:
Originally Posted by Trashed675
What is the advantage of the usb dac over bt or aux?
Also when I tried using aux-> my head unit, while the tablet was plugged into the 12v, I'd get interference. A whining noise that would get higher pitch the higher I revved the engine. Have you come across this?
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I tried Bluetooth with my phone and my Nexus paired to it, and it would constantly switch between devices for no apparent reason. If the Nexus were the only thing paired to it, that might've worked, but I don't feel like removing the Nexus to switch to the correct device every time I get in the car.
You can *mostly* get rid of interference with a ground loop isolator. If you stop/pause your music, there will still be a slight whine, but when the music is on, there is no issue. A USB DAC will amplify the sound so the head unit won't have to be turned up so loud, and should potentially make the whine completely disappear (though I'd defer to others who have actually tried this). For reference, if I plug my iPhone in and put my head unit on a volume setting of 10, that's about the equivalent of putting the aux for the Nexus on 30 and setting the Nexus' system volume at about halfway (so I can control the sound from the Nexus and still be able to make it higher and lower if I want). Because the volume is at 30 on my head unit, I think it's amplifying interference and making it much more noticeable. DAC *should* resolve that.