Sonifex CM-BH4WX Belt-Pack 4-Wire Headphone Amp with 4-Pin XLR Headset Socket

This is a version of the CM-BH4W with a 4 pin XLR headset connection instead of a stereo jack connector. In all other respects it is the same as the CM-BH4W. The XLR connections are: • Pin 1: Microphone non-phase (-) • Pin 2: Microphone phase (+) • Pin 3: Headphone non-phase (-) • Pin 4: Headphone phase (+)