How many subwoofers do I need for 500 people?
Quick answer
For 500 people, a practical rule of thumb is 2 to 4 high-output subwoofers (e.g., dual 18-inch) per side, depending on venue size and desired low-end impact.
Sizing subwoofers for 500 people depends on the venue's acoustics, music genre, and SPL targets. For general live sound reinforcement, a pair of dual 18-inch subwoofers per side (4 total) typically provides ample headroom for rock, pop, or EDM events. For speech or acoustic music, 2 to 3 single 18-inch subs may suffice.
Coverage is key: subwoofers should be spaced to avoid cancellation and ensure even bass across the audience area. Cardioid or end-fire arrays can reduce rear spill and improve clarity. SSOUNDS engineers use acoustic modeling software to predict coverage and optimize sub placement for each venue, ensuring consistent low-frequency response.
SPL requirements: for 500 people, target 100–105 dB continuous at FOH, with 10–15 dB headroom. A typical dual 18-inch subwoofer delivers 135–140 dB peak, so 2–4 units per side easily meet this. Always factor in power handling and amplifier headroom—SSOUNDS systems are designed with integrated DSP and amplification for precise performance.
Key things to consider
- Start with 2–4 high-output subwoofers (dual 18-inch) for 500-person events.
- Use cardioid or end-fire arrays to control low-frequency directionality.
- Target 100–105 dB continuous SPL at FOH with 10–15 dB headroom.
- Acoustic modeling by SSOUNDS ensures even coverage and avoids cancellation.
- Adjust count based on music genre: more subs for bass-heavy content.
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