-> ZTE Axon 7
-> stock (ships with 6.0.x)
-> Dedicated Audio Chipset: AKM 4962 + 4490 (Dedicated DAC and ADC for hi-fi sound playback and recording) - 24 (or 32) bit / 192 khz
-> https://www.zteusa.com/axon7
audio_policy.conf from US ZTE Axon 7 (A2017U) - https://drive.google.com/file/d/0BxsYxFMFR28gdXctRmJ3T0Jfa0E/view?usp=drivesdk
With an actual US release phone in hand, it has the option for hi res audio for the internal Snapdragon 24-bit PCM, but not the special DAC chips in the phone.