- XLR Balanced vs TRS Unbalanced

XLR microphones output a balanced signal, where the microphone signal is carried on pins 2 (hot) and 3 (cold), with ground on pin 1.  So, it takes 3 conductors to create a complete balanced signal.  Minijack type microphones have TRS plugs (Tip, Ring, Sleeve) and carry unbalanced signals.  Unbalanced signals only take 2 conductors to create a complete signal (signal + ground).  Watch this video to understand why balanced XLR microphones have distinct advantages: