Measuring SPL (Maximum Output)

Standard test conditions:

• CEA-2010: Burst signal at rated frequency, measured at 1m, maximum output before 10% THD or any 3rd or 5th harmonic exceeds 10%
• dB Drag: 1/3-octave band measurement at vehicle A-pillar position, windows closed

In-car measurement procedure:

1. Configure system for maximum safe output
2. Play 50 Hz (or competition test frequency) sine tone
3. Place SPL meter at A-pillar (approximately ear height)
4. Record peak reading
5. Verify C-weighting, slow response

[VISUAL PLACEHOLDER: SPLMeterPosition_Diagram.png] Description: Vehicle interior diagram showing standard meter placement positions for different competition organizations — A-pillar, trunk, outside window