How many speakers do I need for 20,000 people?
Quick answer
For 20,000 people, a professional system typically uses 16–24 line array enclosures per side plus 16–32 subwoofers, depending on venue shape and SPL requirements.
Covering 20,000 people requires a system capable of delivering 100–105 dB SPL average across the audience area with at least 10 dB of headroom. For an open field or stadium, this usually means flying 16–24 full-range line array cabinets per side (left/right) and deploying 16–32 subwoofers in cardioid or end-fire arrays to control low-frequency buildup. SSOUNDS engineers use AI-assisted acoustic modeling to predict coverage and adjust box count for uniform SPL and intelligibility.
The exact number depends on factors like venue geometry, desired SPL, and whether the audience is seated or standing. A typical rule of thumb is 1–2 line array boxes per 1,000 people for the main system, plus subs at a 1:1 or 2:1 ratio to mains. For 20,000 people, that translates to 20–40 mains and 20–40 subs. However, SSOUNDS always recommends a site-specific simulation to optimize box count, rigging, and DSP presets for maximum efficiency and minimal interference.
Don't forget delay towers for long or deep venues. For crowds beyond 100 meters from the stage, additional delay hangs (often 8–12 boxes each) may be needed to maintain clarity. SSOUNDS systems are designed with scalable DSP and networking to integrate delays seamlessly, ensuring every seat gets the same high-quality experience.
Key things to consider
- Target 100–105 dB average SPL with 10 dB headroom for music.
- Main line arrays: 16–24 boxes per side (left/right) for 20,000 people.
- Subwoofers: 16–32 units, arranged in cardioid or end-fire for low-end control.
- Use delay towers for venues deeper than 100 meters.
- Always model with acoustic simulation software for precise coverage.
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