5. What is the configuration of the headphone cable?

The FD15 comes standard with a Furukawa monocrystalline silver + Furukawa monocrystalline silver-plated copper braided cable which consists of four large strands for an overall total of 480 wires, with a cross-sectional area of 22AWG.

The cable features swappable plugs : 3.5mm/4.4mm swappable plugs

Earphone connector: expanded MMCX