How loud should a sound system be for 20,000 people?
Quick answer
For 20,000 people, a sound system should deliver 100–105 dB SPL average with peaks of 115–120 dB at the mix position, requiring a large line array system like SSOUNDS’s flown arrays with 16–24 boxes per side and 16–24 subwoofers, depending on venue geometry and music genre.
Sizing a PA for 20,000 people starts with coverage: you need even SPL over a wide area, typically 120–180 degrees horizontal and enough vertical throw to reach the back rows. SSOUNDS engineers use AI-assisted acoustic modeling to predict coverage and SPL distribution, ensuring consistent levels from front to back. A common rule of thumb is 1–2 dB loss per doubling of distance, so you need high sensitivity boxes (≥100 dB 1W/1m) and enough power to hit 105 dB average at 100 meters.
For a crowd of 20,000, flown line arrays with 16–24 boxes per side (depending on throw distance) are typical, paired with 16–24 subwoofers in cardioid or end-fire arrays for low-end impact. SSOUNDS systems are designed for high SPL with low distortion; their DSP presets optimize phase and frequency response for each venue. For rock or EDM, aim for 110 dB average at FOH; for speech or acoustic, 95–100 dB is sufficient. Always factor in headroom (6–10 dB) for transients.
Practical counts: for a 100m deep venue, 24 boxes per side of SSOUNDS large-format line array can deliver 105 dB average at the back. Subwoofer count depends on desired low-end extension: 16–24 subs for 35 Hz extension at 130 dB peak. SSOUNDS engineers model every deployment, but these rules provide a starting point for budgeting and planning.
Key things to consider
- Target 100–105 dB SPL average at mix position, with 115–120 dB peaks for music; speech can be 95–100 dB.
- Use flown line arrays: 16–24 boxes per side for 20,000 people, depending on throw distance and venue width.
- Subwoofers: 16–24 units in cardioid or end-fire arrays for clean low-end coverage.
- Allow 6–10 dB headroom above target average for dynamic peaks.
- SSOUNDS engineers use acoustic modeling to optimize coverage, SPL, and phase alignment for each event.
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