Sound System Tuning Pocket Guide — Free PDF Download

What Is Inside the Sound System Tuning Pocket Guide

This 8-page pocket guide distills decades of live sound engineering knowledge into a field-ready reference you can keep on your phone or print and laminate. Whether you are tuning a portable PA for a corporate event or aligning a line array for a festival, this guide covers the essential workflow from measurement to correction.

Page 1-2: The EQ Workflow

A step-by-step equalization workflow that starts with measurement, not guesswork. The guide walks through:

• Baseline capture: How to take a reference transfer function measurement before touching any EQ controls
• Problem identification: Reading magnitude and phase plots to identify room modes, comb filtering, and boundary reflections
• Corrective EQ strategy: When to cut vs. when to accept. The guide emphasizes subtractive EQ for problems and explains why chasing flat response is often counterproductive
• Verification: How to confirm your corrections improved coherence without introducing new phase issues

Page 3-4: Transfer Function Interpretation

Understanding dual-channel FFT measurements is the foundation of modern system tuning. This section covers:

• Magnitude response: What ±3dB, ±6dB, and ±10dB deviations actually mean for perceived sound quality
• Phase response: Reading wrapped and unwrapped phase, identifying polarity inversions and delay offsets
• Coherence: The most important — and most overlooked — measurement. How to use coherence to distinguish system problems from measurement artifacts
• Group delay: Practical interpretation for crossover alignment and subwoofer integration

Page 5-6: Problem Frequencies Reference Table

A quick-reference table of common problem frequencies organized by source:

• Room modes: Typical first-order modes for common venue dimensions (50-200 Hz)
• Feedback frequencies: The most common feedback bands and their typical causes
• Mains hum: 50 Hz and 60 Hz fundamental with harmonic series identification (ground loop vs. magnetic coupling)
• HVAC noise: Characteristic spectral signatures of different mechanical systems
• Comb filtering: Null spacing formulas for boundary reflections at common distances

Page 7-8: Delay Calculation

Delay alignment is critical for multi-speaker systems. The pocket guide includes:

• Speed of sound formula: c = 331.3 + 0.606T (with temperature lookup table in Celsius and Fahrenheit)
• Distance-to-delay conversion: Quick reference table from 1m to 100m at 20°C
• Subwoofer alignment: Phase-based vs. time-based alignment strategies with decision flowchart
• Delay fill speakers: Haas effect threshold (25-35ms) and practical alignment procedure

Use the Interactive Version in SonaVyx

Everything in this guide can be measured and applied directly in SonaVyx. Open the Transfer Function tool to capture your system response, use the AI Diagnostic for automated EQ recommendations, and run the Problem Detector to identify feedback and hum automatically.