Cayin N5ii DAP is a new for 2018 portable high res music player. It is designed with an emphasis on providing the best sound quality for the money, perfect for people with their own music collections.
Based on android 5.1, using a heavily modified music app, it also has google play access and wifi, so you can use streaming apps like Spotify.
Built around an ESS 9018 dac & amp sections for both balanced 2.5mm out and regular 3.5mm out, with L/M/H gain, it will have no hiss with high sensitivity earphones and provide strong output for most full size headphones.
Very in depth reviews at headfonia.com and headfonics.com.