Audio Speaker Time Alignment
Required delay-tower delay (ms) from speed-of-sound formula; Haas-window offset.
Example
You enter
- Distance from mains (ft) 80
- Distance from delay (ft) 30
- Ambient (°C) 22
- Haas offset (ms) 15
You get
- Speed of sound 344.632
- Time difference 44.22 ms
- Recommended delay 59.2 ms
Checked against published worked examples from: The Engineering ToolBox.
Details, formula, and sources
Formula or tableSpeed of sound c = 331.3 + 0.606 × T_C (m/s). Delay-tower delay (ms) = (d_main − d_delay)_m / c × 1000 + the Haas offset. Haas-window offset 10-30 ms recommended for delayed system natural-source perception.
Source and editionClassical acoustics; AES (Audio Engineering Society) information documents on time-alignment by name.
Free accessAES information documents free at aes.org/standards/blog.
What governsEstimate. AHJ and licensed professional govern.
API field namesd_main_ft, d_delay_ft, ambient_C, haas_offset_ms, c_m_s, ms_difference, recommended_delay_ms
- Default temperature 68 °F (20 °C) unless user suppliesengineering practice