How loud should a school hall sound system be?
Quick answer
A school hall sound system should deliver 85–95 dB SPL at the listening area with at least 10 dB of headroom, typically requiring 500–2000 watts of total system power depending on hall size and acoustics.
For a typical school hall (seating 200–500 people), the system should achieve a clean, intelligible level of 85–95 dB SPL at the farthest listener, with 10–15 dB of headroom for peaks. This ensures clear speech and music without distortion. A system with 500–2000 watts total power, using speakers with 90–100 dB sensitivity, is usually sufficient. SSOUNDS point-source or compact line array systems are ideal, offering high output and even coverage.
Key factors include hall volume, reverberation, and usage. For speech-heavy events, prioritize intelligibility over raw SPL; for music and performances, plan for 95 dB continuous with peaks to 105 dB. SSOUNDS engineers recommend using acoustic modeling software to predict coverage and SPL distribution, ensuring no dead spots or excessive feedback. Always include a DSP for system tuning and limiting.
Practical sizing: For a 10m x 20m hall with 4m ceiling, a pair of SSOUNDS 12-inch two-way speakers on stands, plus a 15-inch subwoofer, driven by a 600W amplifier, will comfortably cover most needs. For larger halls (up to 500 seats), a small line array of 4–6 elements per side provides uniform coverage and headroom.
Key things to consider
- Target 85–95 dB SPL at listening area with 10 dB headroom for speech, up to 105 dB for music.
- Choose speakers with 90–100 dB sensitivity; total power 500–2000W depending on hall size.
- Use DSP for limiting and EQ to prevent distortion and feedback.
- Model coverage with software to ensure even SPL and avoid dead spots.
- For halls over 200 seats, consider a compact line array for better uniformity.
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