Amazon.com: MEE audio Universal MMCX 2.5mm Balanced Audio Cable with 3.5mm Balanced, 4.4mm Balanced, and 3.5mm Stereo Adapter Set for Astell&Kern, FiiO, Sony, HiFiMan, and Other Balanced Sources : Everything Else
FiiO iRC-MMCX
FiiO Earphones-Born for Music
DD ddHiFi BC50 2 pin/3.5mm Short Earphone Cable for FiiO BTR3/5/7, iFi