The theater's renovation included new surround speakers for immersive sound effects. During tech rehearsal for the spring musical, the sound designer routed the actors' wireless mics through the surround system for "envelopment." The actors were not enveloped. They were haunted.

The rear surround speakers, 18 meters behind the performers, sent their amplified voices back at them with a 60ms delay. The actors heard themselves saying their lines a beat after they said them. The leading lady, mid-soliloquy, stumbled over her words because her brain couldn't reconcile her voice arriving from behind her slightly after she spoke. The lead actor described it as "trying to have a conversation with your echo."

Delayed auditory feedback (DAF) is a well-documented phenomenon that disrupts speech production. At delays between 50-200ms, speakers involuntarily slow down, stutter, and increase vocal effort. It's used clinically to treat stuttering but creates it in normally fluent speakers. The 60ms delay was in the worst possible range — too long for the brain to integrate with the direct voice, too short to be consciously ignored.

Actors on stage need to hear front fill and orchestra monitors, not rear-delayed versions of their own voices.

The Moral: Never route live microphones through delayed speakers that point back at the performer. Measure delay times with SonaVyx Transfer Function to ensure all stage monitoring arrives within the integration window.