Solupeak 1 In 3 Out Xlr Balanced Audio Switch Box, 3-Channel Xlr, 3 Box (X103). X103 is a 3-way passive stereo audio splitter. It supports 1 stereo XLR inputs and 3 outputs. You can choose freely according to your audio device. PIN 1 is shield Pin 2 is POS(+) Pin 3 is NEG(-) Specification: Brand: SOLUPEAK Model: X103 Input: 1 pair of XLR input socket Output: 3 pairs of XLR output socket Function: 1 input to 3 outputs Product external size: 120*100*60mm Package weight: 510g Pure switcher box design, no amplification function, no volume control, no power circuit, not affect sound quality. No wires are used internally, the circuit board traces are minimized to reduce sound quality loss For Home audio use It is passive xlr signal source input selector, install with audio rotary switch no need power supply, plug and play solid aluminum case body, aluminum knob, Rear panel is FR4 PCB board