Auditorium Sound System Verification & Commissioning
Auditorium sound systems serve large audiences across challenging geometries — raked seating, balconies, and high ceilings create acoustic environments where speaker placement, delay alignment, and coverage uniformity determine whether every seat receives clear, intelligible audio. SonaVyx provides the commissioning toolkit to verify performance at every position.
Key Challenges
- Coverage uniformity across 500+ seats with varying distances from speaker arrays
- Delay alignment for multiple speaker zones serving stalls, balcony, and gallery levels
- High ceilings (10-20 meters) creating late reflections that reduce speech clarity
- Distributed speaker systems with dozens of zones requiring individual calibration
- Compliance with evacuation system intelligibility requirements (STI > 0.50)
Recommended Tools
Transfer Function
Measure frequency response and phase at multiple seating positions to verify coverage uniformity
SPL Meter
Verify level uniformity across seating zones — target within 6 dB variation from front to rear
STI Measurement
Confirm speech intelligibility meets BS 5839 / EN 54-16 requirements for emergency PA systems
Impulse Response
Measure arrival times for delay alignment and identify problematic late reflections
Measurement Workflow
- 1
Measure Main Array Coverage
Position microphone at seats representing front, center, and rear of the main seating area. Measure frequency response at each position and overlay traces to assess uniformity.
- 2
Set Reference Levels
Drive the main array with pink noise and measure SPL at 5-10 positions across the seating. Target within 6 dB variation from front to rear rows.
- 3
Align Delay Zones
For balcony fills and under-balcony speakers, measure impulse response to determine arrival time offset from the main array. Set delays for Haas-precedence with 5-10 ms additional delay.
- 4
Verify STI Everywhere
Run STIPA at representative positions in each seating zone. All positions must exceed STI 0.50. Emergency PA systems may require STI 0.50 at every seat per BS 5839-8.
- 5
Check Subwoofer Integration
Measure transfer function through the sub/main crossover region. Verify smooth summation without cancellation notches at the crossover frequency.
- 6
Document Commissioning
Generate a commissioning report with measurement data per position, pass/fail verdicts, and system configuration record for the venue management.
Auditorium sound system commissioning is a systematic process of verifying that every speaker, processor, and amplifier in the system works together to deliver consistent audio quality across the entire seating area. Unlike live sound mixing, commissioning establishes the fixed system performance that all subsequent events rely upon. SonaVyx provides the measurement tools to conduct a thorough commissioning process using just a laptop or phone.
Coverage Uniformity
The primary goal of auditorium system design is coverage uniformity — every seat should receive similar frequency response and level. In practice, physics makes perfect uniformity impossible, but well-designed systems achieve 6 dB or less variation in broadband SPL from the nearest to the farthest seat. SonaVyx trace storage lets you capture frequency response at 10-20 positions and overlay them on a single plot, immediately revealing coverage gaps and over-coverage zones.
Line arrays, the dominant speaker technology for auditoriums, achieve uniformity by varying the splay angles between array elements. SonaVyx transfer function measurements verify that the predicted coverage matches reality — the measurement positions confirm the array's throw pattern and identify seats where interference patterns create frequency-dependent nulls.
Delay Alignment
Multi-zone auditorium systems require precise delay settings to maintain the illusion that all sound originates from the stage. SonaVyx impulse response measurement identifies the arrival time of each speaker zone at key positions. The delay finder tool calculates the offset in milliseconds, and the commissioning workflow guides you through the alignment process zone by zone.
Under-balcony fill speakers are critical in auditoriums where the main array's energy is blocked by the balcony structure. These speakers must be delayed relative to the main array so the direct sound from stage arrives first (the Haas precedence effect). Adding 5-10 milliseconds beyond the geometric delay ensures the fill speaker is perceived as reinforcement rather than a separate source.
Emergency PA Compliance
Modern auditoriums require voice alarm systems that achieve STI 0.50 or higher at every seat position for emergency evacuation announcements. BS 5839-8 and EN 54-16 define the testing methodology, and building inspectors increasingly require third-party verification. SonaVyx STIPA measurement provides the rapid assessment method defined in these standards, with results logged per position for compliance documentation.
System Documentation
A professional commissioning report documents the installed system performance for the building owner and future operators. SonaVyx generates reports that include frequency response traces at each measurement position, SPL uniformity data, delay settings, and STI results. This documentation becomes the baseline reference for maintaining system performance over time and diagnosing issues when they arise.
Frequently Asked Questions
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