What size PA system do I need for 20,000 people?
Quick answer
For 20,000 people, you typically need a large-scale line array system with 16–24 boxes per side and 12–18 subwoofers, delivering 105–110 dB continuous SPL at the mix position. SSOUNDS engineers use acoustic modelling to spec the exact system for your venue.
Sizing a PA for 20,000 people depends on venue geometry and coverage requirements. A common rule of thumb is 1–1.5 kW of amplifier power per person, but more practically, you need a flown line array with 16–24 enclosures per side (e.g., SSOUNDS large-format arrays) to achieve even coverage and 105–110 dB SPL at the mix position. Subwoofer count typically ranges from 12 to 18 units, often cardioid-arranged to control low-frequency spill.
Coverage angles must match the audience shape: a wide venue (180°) may require three hangs per side, while a narrow stadium (90°) can use two. SSOUNDS engineers use EASE Focus or similar acoustic modelling to calculate SPL distribution, ensuring consistent level and intelligibility across the entire audience area. Delay towers or fills may be needed for very deep or obstructed seating.
For outdoor events, wind and temperature gradients affect coverage, so additional headroom (3–6 dB) is recommended. SSOUNDS systems are designed for high output with low distortion, and our team provides full system design, including amplifier rack configuration and DSP settings, to meet the specific demands of a 20,000-person event.
Key things to consider
- Flown line array: 16–24 boxes per side for main coverage
- Subwoofers: 12–18 units, often cardioid for LF control
- Target SPL: 105–110 dB continuous at mix position
- Acoustic modelling essential for precise coverage and level
- Consider delay towers or fills for deep/wide venues
Need the right system specced for your venue?
SSOUNDS designs, supplies, installs and tunes professional AVL across Nigeria & Africa.