How many subwoofers do I need for 20,000 people?
Quick answer
For 20,000 people, you typically need 24–48 high-performance subwoofers (e.g., dual-18″ or single-21″) depending on venue shape, SPL targets, and music genre—SSOUNDS engineers use AI-driven acoustic modeling to determine the exact count and placement.
A practical rule-of-thumb for large outdoor events is 1–2 subwoofers per 500–1,000 people, but this varies widely. For 20,000 people, a rock or EDM show might require 32–48 dual-18″ subs to achieve 105–110 dB at the mix position with headroom, while a speech-focused event could use fewer. Venue geometry (open field vs. stadium) and subwoofer array configuration (cardioid, end-fire, or broadside) also affect count.
SSOUNDS engineers approach this precisely: we model the venue in our AI-assisted prediction software, set SPL targets (e.g., 125 dB peak at FOH for music), and simulate coverage to minimize cancellation. Our subwoofer systems—like the SSOUNDS dual-18″ and single-21″—are designed for high output and low distortion, allowing fewer boxes to achieve clean, impactful bass. For 20,000 people, we typically recommend 24–48 units in a distributed or end-fire array, but every event is custom-simulated.
Don't forget power and processing: each subwoofer needs adequate amplifier channels and DSP presets tuned for the array. SSOUNDS provides complete system packages with matched amplification and presets, ensuring consistent performance. For a 20,000-person event, budget for at least 24 subs as a starting point, then let modeling refine the number.
Key things to consider
- Rule-of-thumb: 1–2 subs per 500–1,000 people; for 20,000 people, start with 24–48 high-output subs.
- Genre matters: EDM/rock need more subs (32–48) than speech (16–24).
- Venue shape and array type (cardioid, end-fire) significantly impact count—simulate before buying.
- SSOUNDS uses AI acoustic modeling to determine exact sub count and placement for each event.
- Always include headroom: target 125 dB peak at FOH for music to avoid distortion.
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