How many subwoofers do I need for 20,000 people?
Quick answer
For 20,000 people, you typically need 16–32 high-output subwoofers (e.g., dual-18” or equivalent), depending on venue type, coverage pattern, and desired low-frequency impact.
A general rule of thumb for large-scale events is 1–2 subwoofers per 1,000 people for moderate bass impact, scaling to 2–3 per 1,000 for high-energy genres like EDM or hip-hop. For 20,000 people, that translates to 20–60 subwoofers, but practical deployments often settle at 16–32 premium-grade subs (e.g., dual-18” designs) when using cardioid or end-fire arrays to focus energy and reduce stage wash.
The exact count depends on venue geometry (open field vs. stadium), SPL targets (105–115 dB LF at mix position), and whether you need even coverage across the audience or extra punch in specific zones. SSOUNDS engineers use AI-assisted acoustic modeling to simulate coverage, predict low-frequency summation, and optimize sub placement—often achieving superior results with fewer, more precisely positioned boxes than brute-force stacking.
For example, a 20,000-capacity outdoor festival might use 24 dual-18” subs in a broad arc, while a narrower stadium could require 16 subs with cardioid patterns to control rear spill. Always factor in headroom: running subs at 70–80% of rated capacity ensures clean, distortion-free bass. SSOUNDS recommends a professional system design to match your specific venue and content requirements.
Key things to consider
- Rule of thumb: 1–3 subs per 1,000 people; for 20,000, that’s 20–60 subs, but 16–32 high-output units often suffice.
- Use cardioid or end-fire arrays to focus bass on the audience and reduce stage interference.
- Target 105–115 dB SPL at mix position for low frequencies, depending on music genre.
- SSOUNDS AI modeling optimizes sub count and placement for even coverage and maximum impact.
- Always allow headroom (70–80% max continuous) to avoid distortion and protect drivers.
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