How many speakers do I need for 20,000 people?
Quick answer
For 20,000 people, you typically need 24–36 full-range line array cabinets per side and 24–48 subwoofers, depending on coverage and SPL requirements.
Covering 20,000 people requires a large-scale PA system. A common approach is a left-right line array with 12–18 cabinets per side (e.g., SSOUNDS large-format arrays) to achieve even coverage and 105–110 dB SPL at the farthest seats. Subwoofer count depends on bass impact: 12–24 per side (cardioid or end-fire) is typical for music events.
SSOUNDS engineers use acoustic modelling software (e.g., EASE Focus) to simulate coverage, SPL, and frequency response for each venue. Factors like audience shape, ceiling height, and ambient noise affect the final count. For outdoor events, more cabinets may be needed to overcome wind and distance.
A practical rule: for 20,000 people, budget for 48–72 total line array boxes and 24–48 subs, plus delays or fills if the venue is wide or deep. Always consult a professional system designer for precise deployment.
Key things to consider
- 24–36 line array cabinets per side (12–18 per hang) for main coverage.
- 24–48 subwoofers total, arranged in cardioid or end-fire for bass control.
- Target 105–110 dB SPL at farthest listener; add 3 dB headroom for peaks.
- Use acoustic modelling software for accurate predictions; SSOUNDS offers design support.
- Consider delays or fills for wide/deep venues; outdoor events need more cabinets.
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