How loud should a festival sound system be?
Quick answer
A festival sound system should deliver 100–105 dB SPL at FOH with 6–10 dB headroom, using a line array sized to cover the audience area evenly without exceeding 120 dB at the front or dropping below 85 dB at the back.
For most open-air festivals, target an average level of 100–105 dB at the mix position (FOH), with peaks up to 115–120 dB. This ensures clarity and impact while staying within safe listening limits. The system must have at least 6–10 dB of headroom above the target level to handle transient peaks without distortion.
Selection starts with coverage: measure the audience area (width and depth) and choose a line array with enough elements to throw sound to the back. For a 10,000-person festival, a typical system might use 12–16 boxes per side for mains, plus 8–12 subwoofers per side. SSOUNDS line arrays are designed for consistent coverage and high SPL with low distortion, making them ideal for festival applications.
Always consider local noise regulations and hearing safety. Use prediction software to model SPL distribution and avoid excessive levels. SSOUNDS engineers can help design a system that meets both artistic and regulatory requirements, ensuring a powerful yet safe experience.
Key things to consider
- Target 100–105 dB average at FOH with 10 dB headroom; peaks up to 120 dB max.
- Coverage is key: use line arrays sized to reach the farthest listener evenly.
- Subwoofer array: typically 1:1 or 2:1 ratio of subs to mains per side for bass impact.
- Always model the system with prediction software to avoid hot spots and dead zones.
- Comply with local noise limits and provide hearing protection zones near the stage.
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