Capture the current transfer function of the PA system. Play pink noise or a sweep signal through the system while measuring at the primary listening position.
Play pink noise through PA, press Start to capture baseline
Tuning a PA system by ear alone is unreliable. Room acoustics, hearing fatigue, and the Fletcher-Munson equal-loudness contours all conspire to deceive even experienced engineers. A measurement-based approach using transfer function analysis provides objective data about the system's frequency response, phase behavior, and coherence — the three pillars of sound system alignment. This workflow guides you through the complete process from baseline capture to verified, documented results.
The transfer function H(f) represents the relationship between the electrical signal sent to the loudspeaker and the acoustic signal received at the measurement microphone. It captures everything in between: amplifier response, loudspeaker characteristics, crossover behavior, room reflections, and air absorption. SonaVyx computes the transfer function using the H1 estimator H(f) = Gxy(f) / Gxx(f), which provides accurate results in the presence of measurement noise. The coherence function indicates measurement quality — values above 0.9 mean reliable data, while low coherence suggests contamination from noise, reflections, or time variance.
The SonaVyx AI diagnostic engine analyzes the baseline transfer function to generate specific parametric EQ recommendations. Unlike automatic room correction systems that simply invert the response (which can damage loudspeakers by boosting into deep nulls), the AI engine uses a conservative approach: it primarily recommends cuts at peaks caused by room modes and speaker resonances, and only applies gentle boosts where broadband dips indicate correctable issues. Each recommendation includes the center frequency, gain, Q factor, and a plain-language explanation of why the correction is needed.
Frequency response is only half the picture. Phase alignment is equally critical, especially at crossover frequencies where multiple loudspeaker components (subs, mains, fills) overlap. A 180-degree phase offset at the crossover frequency causes destructive cancellation, creating a deep null that no amount of EQ can fix. This workflow includes a dedicated phase check step that verifies smooth phase transition through the crossover region. If issues are detected, delay adjustments — not EQ — are the correct remedy.
The final verification step captures a new transfer function after all corrections have been applied. The SonaVyx comparison engine computes per-frequency deltas and aggregates them into an overall improvement score. This provides documented proof that the tuning process improved the system — essential for client-facing commissioning reports and for building a track record of measurable results.
Always tune with the room in its expected configuration — curtains, seating, and stage setup all affect absorption and reflection patterns. Use a single measurement position initially (the mix position), then verify at 2-3 additional positions to ensure corrections are beneficial across the coverage area. Avoid applying more than 6-8 parametric EQ bands; if more correction is needed, the physical setup (speaker aim, delay, level) should be addressed first. Save all measurement traces for documentation and future reference.