1. HTC 10
2. Marshmallow 6.0.1
3. Qualcomm "aQstic" internal discreet DAC. [NOTE: NOT the same as Snapdragon DAC (which is what causes it to fail on these phones)]
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.qualcomm.com/news/snapdragon/2016/06/02/qualcomm-aqstic-sets-new-standard-audiophiles&ved=0ahUKEwjNz5qCzJzRAhWI7iYKHbozAXsQFggaMAA&usg=AFQjCNFrhTgbdzlfuS3pccyn8EIvTDrlFg&sig2=NzZ9Ab8gVfOqsUYNnwGASA