Human spatial hearing depends on binaural cues processed by the auditory system. The brain compares the signals arriving at each ear and extracts two primary cues. Interaural Time Difference (ITD) is the arrival time offset between ears, dominant below 1500 Hz, providing directional information for low frequencies. Interaural Level Difference (ILD) is the amplitude difference caused by head shadow, dominant above 1500 Hz. These mechanisms have direct implications for sound system design. A properly configured stereo PA system creates phantom images between speakers by controlling the level and timing of signals at each ear. Delay speakers in distributed systems must be timed so the binaural cues point the listener's perception toward the main system (Haas effect). Binaural measurement is an advanced technique where a dummy head or in-ear microphones capture the complete spatial signature of a room and sound system. The resulting binaural impulse response (BRIR) contains all the spatial information a listener would experience. These measurements are used for virtual reality audio, hearing aid design, and critical evaluation of concert hall acoustics. For practical system tuning, understanding binaural perception helps explain why a frequency response measurement at a single point does not always correlate with subjective quality. The brain integrates information from both ears and applies complex processing that a single measurement microphone cannot replicate. SonaVyx's impulse response measurements capture the room behavior that feeds into binaural perception, helping engineers optimize coverage and timing for the best spatial experience.