I have a reasonable system that sounds fabulous!!!!! (When not using my speaker based system) Apple i phone 6S, Amazon HD service, Apple Lightning device, (whole system wired) Through a fiio IEM FH5 and all WIRED into a Fiio BTR5.
Can be used Bluetooth, but doesn't sound nearly as good. Wired gives you ultra HI DEF, when music allows. WOW BTR5 does wonders with the HD service!!!! Enjoy