MX 3 Pin Microphone Extension socket XLR to MX P-38 Mono plug type Connector cable is used for many professional audio applications. MX XLR adapters do not suffer from insertion loss and high frequency cutoff. MX XLR and MX P-38 Connectors are simple to use, Reliable and provide cable protection. High performance audio interconnect designed for use in a wide variety of home and professional performance and studio applications.