I traded my Huawei P9 plus for a HTC10 today, and that was not even 3 weeks after i sold my last HTC10
Couldn`t stand the Audio from the Huawei. It was unbearable after having had the 10 before. Now i`m sitting here and again i`m shocked how good the Sound from that little thing is. There`s no need for Viper, Dolby, Boomsound, absolutely nothing. You install Poweramp, and it blows you away. Now my previous one was on Marshmallow and this one is on Nougat, and i think the sound quality is even better (Or it´s just my ears orgasming after the P9 Plus).
Anyway, i couldn`t care less what DAC/AMP combo it has, fact is, it sounds better than any musical smartphone i`ve ever listened too - including Meizu pro 5, Lemax 1, xiaomi mi note pro, V10, apples and lots of others. It sounds even better than the Fiio X3 ii i had, but that maybe because the sound is a little bit warmer which i prefer.