How many watts of PA do I need for 20,000 people?
Quick answer
For 20,000 people, you typically need a large-scale line array system capable of 110–120 dB SPL at distance, requiring 24–48 enclosures per side and 24–48 subwoofers, depending on venue geometry and content. SSOUNDS engineers use AI-assisted acoustic modeling to specify exact configurations.
Sizing a PA for 20,000 people depends on coverage area, desired SPL, and content type. A general rule of thumb is 1–2 watts per person for outdoor events, but modern line arrays are far more efficient. For a typical festival or stadium show, you'd aim for 105–110 dB A-weighted at the mix position, with headroom for peaks. This often translates to 24–36 line array enclosures per side (e.g., SSOUNDS large-format arrays) and 24–48 subwoofers, flown or ground-stacked, to achieve even bass coverage.
Venue geometry matters: a wide, shallow field needs more hangs or delays, while a deep, narrow space can use fewer boxes with longer throw. SSOUNDS engineers use AI-assisted acoustic modeling to predict coverage and SPL distribution, optimizing box count and rigging points. For 20,000 people, expect a total system power of 50,000–100,000 watts RMS, but actual SPL depends on driver sensitivity and DSP tuning.
Don't forget amplification and processing: SSOUNDS systems use proprietary DSP and Class-D amplification to maximize headroom and protect drivers. A typical setup might include 12–16 amplifier racks, each powering multiple enclosures. Always consult with a professional system designer—SSOUNDS provides full simulation and on-site support to ensure your event sounds clear and powerful.
Key things to consider
- Target 105–110 dB A-weighted at mix position for speech/music; 120 dB+ for peak-heavy genres.
- Use 24–48 line array enclosures per side (e.g., SSOUNDS large-format) and 24–48 subwoofers.
- Total system power: 50,000–100,000 watts RMS, but efficiency varies by driver and DSP.
- Venue shape dictates delay fills or additional hangs; SSOUNDS AI modeling optimizes coverage.
- Always include headroom (6–10 dB) and factor in environmental conditions (wind, temperature).
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