How loud should a festival sound system be?
Quick answer
A festival sound system should deliver 100–105 dB SPL average at FOH with 10–15 dB headroom (115–120 dB peaks), covering the audience area evenly at 65–70 dB signal-to-noise ratio above ambient noise.
Festival sound system loudness isn't just about raw volume—it's about controlled coverage and headroom. Target 100–105 dB SPL average at the mix position (FOH) with 10–15 dB of peak headroom, meaning the system must handle 115–120 dB peaks cleanly. This ensures dynamic impact without distortion. Ambient noise at festivals (crowd, generators, wind) often sits at 70–80 dB, so a 65–70 dB signal-to-noise ratio is needed for clarity.
For practical sizing, a medium festival (5,000–10,000 people) typically requires 8–12 line array cabinets per side with appropriate subwoofer support (e.g., 8–16 subs flown or ground-stacked). Larger events (20,000+) may need 16–24 per side. Use prediction software to model SPL decay—aim for no more than 6 dB drop from front to back. SSOUNDS line arrays are engineered for consistent pattern control and high output, delivering the required SPL with low distortion across the audience.
Don't overlook subwoofer coverage: festival bass needs to be felt, not just heard. A typical rule is one subwoofer for every two full-range boxes, but tune the array to avoid cancellation. Always measure with an SPL meter (C-weighted, slow response) at multiple points and adjust DSP presets—SSOUNDS systems include factory-tuned presets that optimize headroom and tonal balance for outdoor environments.
Key things to consider
- Target 100–105 dB average at FOH with 115–120 dB peak headroom for clean dynamics.
- Ensure 65–70 dB signal-to-noise ratio above ambient festival noise (70–80 dB).
- Use line arrays: 8–12 boxes per side for 5,000–10,000 people; 16–24 for 20,000+.
- Match subwoofer count to full-range boxes (1:2 ratio) and tune for even bass coverage.
- Always verify with SPL measurements and use manufacturer DSP presets for outdoor optimization.
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