Music Production
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Speaker delay time quantifies the milliseconds needed to align multiple speakers' acoustic arrival at the listening position. When speakers are positioned at different distances, sound waves from farther speakers arrive later than from closer ones, causing phase misalignment, comb filtering, and frequency response coloration. Adding digital delay to the closer speaker(s) compensates, creating coherent, transparent sound. This is essential in surround mixing, PA system alignment, and reference monitor setup where accurate stereo imaging and frequency response depend on phase coherence.
Sound propagates at approximately 343 m/s (varies with temperature). Delay equals the distance traveled divided by sound speed. A speaker 3 meters farther away produces a 8.8 millisecond delay (3 ÷ 343 × 1000 = 8.75 ms). This delay shifts the phase of that speaker's output relative to a closer speaker. Using delay compensation aligns the phase, eliminating phase cancellation across the frequency spectrum and ensuring balanced tone.
Delay Time (ms) = Distance (meters) ÷ 0.343 (speed in m/ms). Or: Delay (ms) = (Distance difference ÷ 343) × 1000.
Because sound travels at 343 m/s, even 1 meter of distance difference creates a 3 ms delay—noticeable to human hearing, especially in the 1-4 kHz range where ears are most sensitive. At 2 meters difference, you get ~6 ms delay, easily audible as phase issues, loss of stereo imaging, or thin sound.
Measure the distance from each speaker to your primary listening position. If distances vary by more than 0.5 meters, add delay. Test by toggling delay on/off: with proper delay, the image should be centered and coherent; without it, you may hear phase-related colorations or off-center imaging.
No, delay time is always positive (future time). You add delay to shift a signal later in time. If you need to 'advance' a signal, it means it's already delayed too much—reduce its delay or increase another speaker's delay to the same timeline.
Measure distances to all channels from the primary listening position. In 5.1 surround, delay the left/right surround channels relative to the center, and delay height channels (if present) relative to the main L/C/R. Subwoofers often need separate delay. Follow your mixing console's delay routing structure to organize this properly.
