How loud should a political rally sound system be?
Quick answer
For a political rally, the sound system should deliver 95–105 dB SPL at the audience area with clear speech intelligibility, typically requiring 2–4 kW of power per 1,000 attendees in an outdoor setting.
Political rallies demand high speech intelligibility and consistent coverage, not just raw volume. The system must overcome ambient noise (crowd chatter, traffic) without distortion. A target of 95–105 dB SPL at the listening position is standard, with headroom for peaks. For outdoor rallies, plan for 2–4 kW of amplifier power per 1,000 attendees, but this varies with venue acoustics and background noise.
SSOUNDS recommends using a line array or distributed point-source system to ensure even coverage. For a rally of 5,000 people, a medium-format line array (e.g., 8–12 boxes per side) with dedicated subwoofers for low-end punch is ideal. Speech frequencies (1–4 kHz) must be clear; avoid over-processing. Always include a delay tower system for large crowds to maintain intelligibility at the back.
Practical sizing: For 1,000 attendees outdoors, a single pair of high-output point-source speakers (e.g., 2× 15" + 2" horn) on stands may suffice. For 5,000+, deploy a flown line array. Indoor rallies need less power due to reflections; aim for 90–100 dB SPL. Always measure with an SPL meter at multiple points and use DSP to limit maximum output to prevent feedback and hearing damage.
Key things to consider
- Target 95–105 dB SPL at the audience area for outdoor rallies; 90–100 dB SPL indoors.
- Use line arrays for crowds over 2,000 to ensure even coverage and speech clarity.
- Include subwoofers for impact but keep crossover low (80–100 Hz) to avoid muddiness.
- Plan for 2–4 kW per 1,000 attendees outdoors; less power needed indoors.
- Always deploy delay speakers for crowds deeper than 50 meters to maintain intelligibility.
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