How many subwoofers do I need for a concert?
Quick answer
The number of subwoofers needed depends on venue size, desired SPL, and coverage requirements; a typical rule is one subwoofer per 100–200 audience members for moderate bass impact.
Determining the right number of subwoofers for a concert involves balancing coverage, output, and budget. Key factors include venue size (indoor vs. outdoor), audience capacity, music genre, and target SPL. For example, electronic or hip-hop events demand more low-end energy than acoustic sets. A common starting point is one subwoofer per 100–200 people for moderate levels, but larger events may require one per 50–100 for high-impact bass.
Professional system design uses modeling software to predict coverage and SPL distribution. SSOUNDS engineers recommend measuring the venue’s volume and calculating required SPL at the furthest listening position. Cardioid or end-fire arrays can reduce rearward energy and improve clarity. Always consider amplifier power and DSP presets to ensure subwoofers operate within their linear range without distortion.
For outdoor festivals, subwoofers often need to be flown or ground-stacked in clusters to achieve even coverage. A typical rule of thumb: for every 1,000 people, plan for 4–6 high-output subwoofers (e.g., dual 18-inch) for rock/pop, and 6–8 for bass-heavy genres. Always consult with a system engineer or use acoustic simulation to finalize the count.
Key things to consider
- Calculate required SPL at the furthest listener; use 100–105 dB as a baseline for moderate impact.
- One subwoofer per 100–200 people for general use; double for bass-heavy genres.
- Use cardioid configurations to reduce stage rumble and improve front-of-house clarity.
- Model coverage with software (e.g., EASE, Soundvision) to avoid dead spots.
- Always allow headroom: run subs at 70–80% of rated continuous power for reliability.
Need the right system specced for your venue?
SSOUNDS designs, supplies, installs and tunes professional AVL worldwide.