How many subwoofers do I need for 100 people?
Quick answer
For 100 people, a single high-quality 18-inch subwoofer is typically sufficient for moderate SPL, but SSOUNDS engineers recommend two subwoofers for even coverage and headroom.
For an audience of 100 people, the number of subwoofers depends on the desired SPL, music genre, and venue acoustics. As a rule of thumb, one professional 18-inch subwoofer (e.g., from SSOUNDS) can provide adequate low-frequency output for background music or speech reinforcement in a small room. However, for live music or events requiring impactful bass, two subwoofers are recommended to achieve even coverage and reduce strain on a single driver.
SSOUNDS engineers approach subwoofer sizing with acoustic modeling software, factoring in room volume, coupling, and target SPL. For 100 people in a typical indoor space (approx. 200-300 m²), two subwoofers placed symmetrically can deliver 105-110 dB SPL at low frequencies with good uniformity. In outdoor settings, more subwoofers or higher-output models may be needed to overcome ambient noise.
Key considerations: subwoofer placement (cardioid or end-fire arrays can improve pattern control), crossover frequency (typically 80-120 Hz), and amplifier power. SSOUNDS offers scalable subwoofer systems that integrate with line arrays or point-source tops, ensuring precise alignment and phase coherence.
Key things to consider
- One 18-inch subwoofer is a minimum for 100 people; two are recommended for live music.
- SSOUNDS uses acoustic modeling to optimize sub count for room volume and SPL targets.
- Placement and array configuration (e.g., cardioid) improve low-frequency control.
- Match subwoofer output to main PA system for coherent sound.
- For outdoor events, increase sub count or use higher-output models.
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