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 Extreme Audio Premium Gold Plated Mini Toslink to Mini Toslink (mini SPDIF to mini SPDIF) Optical Audio Cable. Used to Connect Your High Resolution Audio with Optical Output with Portable Amplifiers with Optical Input Fiber optical cable eliminates electromagnetic interference (EMI) and radio frequency interference (RFI) Premium Toslink Cable Engineered with Durable PVC Layers with Gold Plated Connector Supports uncompressed PCM audio or compressed 5.1 and 7.1 surround sound including Dolby Digital Plus and DTS-HD Mini Toslink to Mini Toslink Cable is compatible with Astell&Kern AK100 AK120 AK100II AK120II AK240 AK380 AK320