SPL Meter Measurement per AES-2id

AES-2id and SPL Measurement

The AES-2id system alignment process relies heavily on SPL measurement at multiple stages. Understanding where and how to apply your SPL meter determines the quality of your final system tune.

Gain Structure Verification

Before any acoustic measurements, AES-2id emphasizes proper gain structure:

• Measure electrical noise floor at the amplifier output with pink noise at nominal level
• Verify that each amplifier channel produces the expected SPL at 1 meter
• Confirm that signal-to-noise ratio exceeds 60 dB at the listening position
• Document headroom: difference between nominal operating level and clip point

Coverage Mapping

SPL mapping across the venue reveals coverage uniformity:

1. Generate pink noise at nominal system level
2. Measure LAeq at a grid of positions (typically 2-3 meter spacing)
3. Document level at each position relative to a reference position
4. Target: less than 6 dB variation across the primary coverage area
5. Identify hot spots and dead zones for correction

Sub-Main Level Matching

When aligning subwoofers with main speakers, SPL measurement confirms level balance at the crossover frequency region. Measure both systems independently, then combined, to verify constructive summation.

Common Mistakes

• Using peak SPL instead of LAeq for coverage mapping
• Measuring in a single plane instead of at ear height throughout the venue
• Forgetting to account for atmospheric absorption at high frequencies over distance
• Not documenting the measurement conditions (temperature, humidity)

SonaVyx Integration

The SonaVyx SPL meter provides continuous Leq logging ideal for walk-around coverage mapping. Pair it with the transfer function analyzer for frequency-dependent level analysis. Use the RTA mode for real-time spectral feedback during gain staging. The AI diagnostic engine can evaluate your coverage data automatically. Check problem detection for any anomalies. Refer to our PA tuning workflow for the complete process.