Find the delay to time-align fills, delay towers and subs to your mains, corrected for air temperature. Updates live as you type.
Delay for fills, delay towers and subs, temperature-corrected.
Speed of sound = 331.3 × √(1 + T/273.15) m/s. Delay = distance ÷ speed. Add this to the further (downstream) speaker so it lines up with the mains.
Find the delay to time-align fills, delay towers and subs to your mains, corrected for air temperature. Updates live as you type.
Measure the distance between the main PA and the delay speaker, divide by the speed of sound, and add that delay to the downstream (further) speaker. Now its sound leaves a fraction later and arrives in step with the wavefront from the mains, so the system sounds like one source instead of an echo.
The speed of sound rises with temperature: about 331 m/s at 0 degrees and 343 m/s at 20 degrees. On a hot day or in a warm room the figure climbs, which slightly shortens the delay you need, so for long throws it is worth correcting.
There is no single limit, the right delay is whatever lines the speakers up in time. Many engineers also add 5 to 15 milliseconds extra on a delay tower so the main PA reaches the listener first (the Haas effect), which keeps the image anchored on the stage.
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