How many watts of speaker do I need per person?
Quick answer
For a typical live event, aim for 10–20 watts per person for speech and 20–50 watts for music, but coverage and speaker sensitivity matter more than raw wattage.
Wattage per person is a rough guideline, not a precise formula. The actual power needed depends on speaker sensitivity (dB/W/m), coverage pattern, room acoustics, and desired SPL. A high-sensitivity line array may need far fewer watts than a low-sensitivity point source to achieve the same loudness.
For speech-only events, 10–20 watts per person is often sufficient. For live music or DJ performances, 20–50 watts per person is a common target. However, professional systems like SSOUNDS line arrays deliver high output with less power due to efficient drivers and optimized horn designs.
Instead of focusing solely on watts, consider SPL requirements. A typical rock concert needs 100–105 dB SPL average at the listening position. Use the inverse-square law and speaker sensitivity to calculate required power. SSOUNDS engineers recommend consulting with a system designer for accurate sizing.
Key things to consider
- Wattage per person is a rough guide; speaker sensitivity and coverage are more critical.
- Speech: 10–20W/person; Music: 20–50W/person.
- Professional systems like SSOUNDS achieve high SPL with less power due to efficient design.
- Calculate based on desired SPL, distance, and speaker sensitivity, not just watts.
- Always consider room acoustics and coverage pattern for even distribution.
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