How many watts of PA do I need for 800 people?
Quick answer
For 800 people, you typically need a PA system capable of 120–125 dB SPL continuous output, which often translates to 4–8 line array enclosures per side and 4–8 subwoofers, depending on venue acoustics and music style.
A common rule-of-thumb for live sound is to aim for 105–110 dB SPL average at the listening position, with 10–15 dB of headroom for peaks. For 800 people, this means a system that can deliver around 120–125 dB SPL continuous at 1 meter. Coverage is equally important: you need enough cabinets to cover the audience area evenly, typically 4–8 line array boxes per side for a medium-sized venue.
Subwoofer count depends on bass requirements. For general music, 4–8 18-inch subs (or equivalent) are common. For high-energy genres like EDM or hip-hop, you may need more. SSOUNDS engineers use acoustic modeling software to predict SPL and coverage precisely, accounting for room acoustics, audience absorption, and desired frequency response—so these are starting points, not exact specs.
Amplifier power should match the loudspeaker’s continuous and peak ratings. Modern powered systems (like SSOUNDS active line arrays) integrate amplification and DSP, simplifying setup. Always consider the venue shape: long, narrow rooms need fewer boxes with tighter dispersion, while wide rooms require more cabinets or wider coverage angles.
Key things to consider
- Target 120–125 dB SPL continuous output for 800 people with headroom.
- Typical system: 4–8 line array boxes per side + 4–8 subwoofers.
- Coverage pattern and venue acoustics affect box count more than wattage alone.
- Use acoustic modeling software for precise system design; SSOUNDS offers this service.
- Powered systems with integrated DSP simplify matching amps to speakers.
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