How many watts of PA do I need for 800 people?
Quick answer
For 800 people, you typically need 4,000–8,000 watts of continuous power, but coverage and SPL targets matter more than raw wattage. SSOUNDS engineers recommend a system delivering 120–125 dB peak SPL across the audience area.
Wattage alone is a poor metric for PA sizing because efficiency and coverage vary widely. For 800 people in a typical indoor venue (e.g., conference hall, club, or house of worship), aim for 120–125 dB peak SPL at the farthest listener. This usually requires 4–8 high-output line array elements per side (e.g., SSOUNDS line arrays) plus 4–6 subwoofers, driven by amplifiers rated 4,000–8,000 watts continuous total. Outdoor events or high-energy music may need 50–100% more power.
A practical rule of thumb: for speech and moderate music, 1 watt per person is a starting point (800W), but for full-range, high-impact sound you need 5–10 watts per person (4,000–8,000W). However, coverage pattern and array configuration matter more. SSOUNDS engineers use acoustic modelling software to calculate exact SPL, coverage, and power requirements based on venue geometry, audience layout, and desired headroom.
For 800 people, a typical SSOUNDS system might include 8–12 compact line array enclosures per side (e.g., dual-8″ or dual-10″ boxes) and 4–6 dual-18″ subwoofers, powered by 4–6 amplifier channels delivering 2,000–4,000W each. This ensures even coverage, high intelligibility, and sufficient low-end impact. Always consult a professional system designer for precise specifications.
Key things to consider
- Focus on SPL targets (120–125 dB peak) and coverage, not just wattage.
- Rule of thumb: 5–10 watts per person for full-range music (4,000–8,000W total).
- Indoor vs. outdoor: outdoor events require 50–100% more power.
- Box count: 8–12 line array elements per side + 4–6 subwoofers is typical.
- SSOUNDS engineers use acoustic modelling for precise system design.
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