Connector for iFi Sony NW-WM1Z 1A MDR-Z1R TA-ZH1ES PHA-2. 16 Cores 1/4 6.35mm Male to 4.4mm Female Balanced Audio Adapter Cable. Connector: 1/4 6.35mm male to 4.4mm female balanced. Started to produce cables since 2013, accept to customize all kinds of headphone upgrade cables or audio adapters in different core types, connector types and cable lengths.
eBay