HombreCangrejo
100+ Head-Fier
Sorry for the stupid question, but what is the 4-pin cable that came with the Masters for? Would guess it's a balanced cable, but it's a 3,5mm connector and I know no DAP which features a balanced jack of that size.
Hifiman models have 3.5mm balanced, but yes, the usual connector these days is 2.5mm TRRS.