Extreme Audio 3.5mm Stereo (4 Pole) to RCA Digital Coaxial Audio Connection Cable for FiiO X3 2nd Generation, FiiO X5 2nd Generation and Fiio X7 (6ft) $49.95 B01AF98IY0
Extreme Audio Premium Quality Gold Plated Mini Toslink to Mini Toslink (SPDIF) Digital Optical Audio Cable with Metal Connectors for Astell&Kern AK100 AK120 AK100II AK120II AK240 AK380 AK320 $19.95 B01AFIMKH2