MusicReasonRooms, Monitoring, and Acoustic Calculations
How much delay does this distance difference need?
Enter a distance difference between two sound sources. This tool converts it to a time-alignment delay under a declared speed of sound, and states plainly which source should be delayed.
Answer
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Understand
A positive distance offset here means the source in question is farther away, so its sound arrives later; delaying the closer source by the calculated amount realigns the two arrivals in time. This tool never accounts for a specific device or system's own processing latency automatically: add that separately if it applies.
Worked example
A path-length difference of 0.343 meters at 343 m/s equals exactly 1 millisecond of delay. Doubling the distance difference doubles the required delay time, and a zero distance difference needs zero delay.
Method and limitations
Delay time is t = d / c, where d is the distance difference and c is the declared speed of sound. Sign is a user-visible convention describing which source leads or lags, not a claim about which speaker should be physically moved.
Where this comes up in practice
Time alignment matters whenever two sources of the same sound reach a listening position at meaningfully different times: a subwoofer set back from the main speakers, two microphones on the same instrument at different distances, or a distributed speaker system covering a large room. In every case the underlying question is identical, how far apart are the two path lengths, which is exactly the single input this calculator asks for.