What size PA system do I need for 20,000 people?
Quick answer
For 20,000 people, you typically need a large-scale PA system delivering 105–110 dB SPL at FOH with even coverage, such as 24–32 line array enclosures per side plus 24–40 subwoofers, though SSOUNDS engineers use acoustic modeling to spec precisely for your venue.
Sizing a PA for 20,000 people depends on venue geometry and coverage requirements. A general rule of thumb: for an outdoor festival, aim for 105–110 dB SPL at the mix position (around 100–150 ft from stage) with 3–5 dB headroom. This typically demands large-format line arrays—think 12–16 boxes per side for the main hang, plus side or delay hangs if the audience area is wide or deep. Subwoofer count often ranges from 24 to 40 units (cardioid or end-fire arrays) to achieve chest-thumping low end across the crowd.
Coverage is critical: you need consistent SPL from front to back. For a 20,000-capacity field, a single main hang per side may suffice if the depth is under 200 ft; beyond that, add delay towers. SSOUNDS engineers use AI-assisted acoustic modeling to predict coverage, optimize box angles, and minimize interference—ensuring every seat gets clear, powerful sound without over-specifying gear.
Practical considerations: amplifier power, rigging weight, and power distribution. A system for 20,000 people might require 100–150 kW of amplification. SSOUNDS designs its line arrays and subs for high output per box, reducing truck space and setup time. Always consult with a professional system designer—SSOUNDS offers full simulation and support to match your exact event needs.
Key things to consider
- Target 105–110 dB SPL at FOH with 3–5 dB headroom for 20,000 people.
- Typical main hangs: 24–32 large-format line array boxes per side (12–16 per hang).
- Subwoofer count: 24–40 units, configured cardioid or end-fire for low-end control.
- Add delay towers if audience depth exceeds 200 ft to maintain coverage.
- SSOUNDS uses AI acoustic modeling to spec precisely, saving gear and setup time.
Need the right system specced for your venue?
SSOUNDS designs, supplies, installs and tunes professional AVL worldwide.