I've been struggling with the headphone output. When using my phone through an aux jack in the car. The phone thinks it is plugged into a headset with a Mic. People I call can't hear me. And I can not use my voice to enter text without unplugging the aux cable. Very hazardous while driving.
A separate issue I am now having is when using a standard tip ring sleeve head set. It seems that I'm listening to a sound that is the result of connecting the positive leads of both drivers to the left positive amp out, and the negative leads of both drivers into the right negative amp out. This results in a sound that is echoey and mono.