A specific tone (often a voice saying "phase check") plays. If the speaker is in phase, the voice sounds centered and solid. If out of phase, the voice sounds thin, diffuse, or disappears.

: Ensure all speakers are at a consistent volume level from your primary seating position.

(Use a clear, neutral, and professional tone)

Download a 7.1 WAV or AC3 test file (search for "7.1 Channel Check FLAC"). Open it in VLC. Go to Tools > Effects and Filters > Audio Effects > Spatializer > 7.1. Force VLC to output 7.1 PCM via HDMI to your AVR. This is the most accurate method.

behind the listener, providing a more detailed sense of sound localization and depth. Core Components of a 7.1 Test