ATAUDIO Hifi 2.5mm TRRS Balanced to 2 RCA Male Cable For Astell&Kern AK100II,AK120II,AK240, AK380,AK320,DP-X1 - AliExpress
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 - Walmart.com
1.2M 2.5mm Balanced Male to 3.5mm Balanced Male Cable
Balanced Cable with MMCX Connector (2.5mm Jack) - Brainwavz Audio
4.4mm Male to 2.5mm Female Balanced Adapter | Hidizs