How do you use delay speakers in live sound?
Quick answer
Delay speakers are used in live sound to synchronize audio arrival times for distant audience areas, ensuring clarity and even coverage by compensating for the natural propagation delay of sound from the main PA.
In live sound, delay speakers are positioned further from the stage than the main PA to cover areas where the main system's sound arrives late or is obstructed. The key is to time-align them so that sound from the delay speakers reaches the listener at the same moment as sound from the main system. This prevents echoes and comb filtering, preserving intelligibility and impact.
To set up delays, measure the distance from the main PA to the delay position, then calculate the delay time (approx. 1 ms per foot or 3 ms per meter). Use a DSP with delay capability to apply that offset. Fine-tune by ear or with measurement software (e.g., SMAART) to account for environmental factors. SSOUNDS DSP systems include precise delay tools and presets to simplify this process for consistent results.
Delay speakers should be chosen for their pattern control and SPL capability to match the main system. SSOUNDS point-source or compact line array models are ideal, as they offer consistent voicing and coverage. Proper deployment ensures every seat in the venue experiences the same clarity and energy, which is critical for large venues, festivals, and houses of worship.
Key things to consider
- Measure distance from main PA to delay position to calculate delay time (1 ms/ft or 3 ms/m).
- Use DSP with delay alignment; SSOUNDS DSP provides precise time alignment and presets.
- Choose delay speakers with matching voicing and coverage pattern to the main system.
- Verify alignment with measurement software like SMAART for optimal coherence.
- Position delays to cover shadow zones without overlapping main coverage excessively.
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