What size PA system do I need for 800 people?
Quick answer
For 800 people, you typically need a medium-format PA system delivering 120–125 dB SPL with even coverage, such as 8–12 line array enclosures per side and 4–8 subwoofers, depending on venue shape and music content.
Sizing a PA for 800 people starts with coverage: you need to evenly cover the audience area, typically 20–30 meters deep. A rule of thumb is 2–3 dB of headroom above the average listening level (95–100 dB for speech, 105–110 dB for music). For live music, target 120–125 dB SPL at FOH position. This usually requires a medium-format line array — 8 to 12 boxes per side for a standard 90° x 40° coverage pattern — plus 4 to 8 subwoofers for low-end extension.
Venue shape matters: a wide, shallow room may need more boxes for horizontal coverage, while a long, narrow room needs more vertical array elements. For outdoor events, add 3–6 dB SPL to overcome ambient noise. SSOUNDS engineers use acoustic modelling software (e.g., EASE, Soundvision) to precisely predict coverage, SPL distribution, and system interaction — ensuring every seat gets consistent, intelligible sound.
Practical configuration: for 800 people in a typical indoor hall (e.g., 30m x 20m), a left-right line array with 10–12 boxes per side (e.g., SSOUNDS medium-format enclosures) and 4–6 flown subs or 6–8 ground-stacked subs will deliver clean, powerful sound. For speech-only events, you can reduce sub count and SPL targets. Always consider amplifier power and DSP presets to protect drivers and optimize performance.
Key things to consider
- Target SPL: 120–125 dB for music, 95–100 dB for speech at listening position.
- Coverage: 8–12 line array boxes per side for 20–30m depth; 4–8 subs for low end.
- Venue shape and acoustics significantly affect box count — use modelling software.
- SSOUNDS engineers provide precise system design with acoustic modelling.
- Always include 3–6 dB headroom for peaks and outdoor environments.
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