How to Commission an AV System
Quick Answer
Commissioning an AV system means systematically verifying that every audio and video component meets its design specifications through a documented series of measurements, functional tests, and performance evaluations. A thorough commissioning process ensures the installed system performs as intended and provides the client with a traceable record of system performance.
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Equipment Needed
- ✓SonaVyx Transfer Function, SPL, and STI measurement tools
- ✓Calibrated measurement microphone
- ✓Audio interface for dual-channel measurement
- ✓Laser distance meter for position documentation
- ✓Camera for photographic evidence
- ✓Cable tester and polarity checker
Step-by-Step Guide
Review Design Documentation
Before touching any equipment, review the system design documents including equipment list, signal flow diagrams, speaker placement drawings, and design targets. Note the specified coverage area, target SPL at various positions, required STI values, background noise criteria, and frequency response tolerances. These design targets become your pass/fail criteria during commissioning. If design documentation is incomplete, establish agreed-upon targets with the client before beginning measurements.
Verify Physical Installation
Walk the installation and verify that all equipment matches the design specification: correct speaker models in correct positions, proper rigging and safety, cable routing and labeling, equipment rack assembly, and grounding. Check that every connection is secure, every speaker is aimed correctly, and every cable is labeled at both ends. Test cable continuity and polarity with a cable tester. This physical verification catches installation errors before they complicate electronic commissioning.
Set Gain Structure
Working from input to output, verify that gain staging is correct throughout the signal chain. Check that each device operates at its optimal signal level with adequate headroom. Measure noise floor at the output with all inputs muted: it should be at least 60 dB below the nominal operating level. Test headroom by driving the system to its maximum rated output and verifying clean reproduction. Document the gain setting at each device for the system operations manual.
Measure Coverage and Uniformity
Using SonaVyx's SPL meter, measure the sound level at a grid of positions throughout the coverage area (typically every 2 to 3 meters) while playing pink noise at the system's nominal operating level. Create a coverage map showing SPL variation. The design target for speech systems is typically plus or minus 3 dB variation; for music systems, plus or minus 6 dB. Identify any dead spots or hot spots that exceed the tolerance. Adjust speaker aim, processing, or delay settings to improve uniformity.
Measure Frequency Response and EQ
Capture transfer function measurements at the primary listening position and 4 to 6 secondary positions. Apply system EQ to achieve the target frequency response curve within the specified tolerance. Store reference traces for each position in SonaVyx. Measure the response of each speaker zone independently and combined. Verify that all crossovers, delays, and levels are optimized for smooth summation. The system should meet its frequency response specification from the lowest rated frequency to 12 kHz minimum.
Test Speech Intelligibility
For voice alarm, paging, and speech reinforcement systems, measure STIPA at positions specified in the design or at a representative grid. Most building codes and standards (EN 54-16, BS 7443) require minimum STI of 0.50 for emergency voice systems. Record STI at each position and flag any below the threshold. If STI is inadequate, the commissioning has identified a problem that must be resolved before handover. Use SonaVyx's STI tool with the STIPA test signal.
Functional Testing
Test every system function: zone selection, paging, emergency voice alarm override, background music distribution, volume control, source selection, and automatic failover. Verify that priority override works correctly (emergency announcements override all other audio). Test battery backup systems under simulated power failure. Verify remote control and monitoring functions. Document each test result as pass, fail, or conditional pass with specific notes.
Generate Commissioning Report
Compile all measurements, test results, and settings into a formal commissioning report using SonaVyx's report generator. Include: executive summary, system description, measurement methodology, coverage maps, frequency response traces, STI results at each position, background noise assessment, functional test results, equipment settings (EQ, delay, levels), and a commissioning certificate with digital signature. This report becomes part of the building documentation and serves as the baseline for future maintenance and re-certification.
AV Commissioning Standards
Several standards define commissioning requirements for different AV system types. EN 54-16 specifies requirements for voice alarm systems, including STI testing at defined positions. BS 7443 covers sound systems for emergency purposes. AVIXA/InfoComm standards address general AV system performance. Understanding which standards apply to your project determines the measurement scope, acceptance criteria, and documentation requirements.
Common Commissioning Failures
The most frequent commissioning failures include insufficient coverage at boundary positions (under balconies, corners, near exits), background noise exceeding design criteria due to HVAC installation changes, STI below 0.50 in areas with high reverberation, and frequency response deviation greater than 6 dB from the target curve. Each failure triggers a remediation process: identify the cause, implement the correction, and re-measure to verify compliance. SonaVyx's before/after comparison tool documents the improvement.
Handover Documentation
A complete commissioning handover package includes the commissioning report with all measurements, system operations manual, equipment manuals and warranties, as-built drawings, DSP configuration backups, cable schedule, and maintenance recommendations. This documentation ensures the system can be maintained, re-calibrated, and troubleshot throughout its operational life, which typically spans 10 to 20 years for installed AV systems.
Common Mistakes to Avoid
Commissioning before the room is complete, which means furniture, finishes, and acoustic treatment may change measurements
Testing at one or two positions and extrapolating to the entire coverage area
Omitting background noise measurement, which affects STI and may indicate HVAC installation problems
Not documenting DSP settings and EQ curves, making future maintenance and re-calibration impossible
Rushing commissioning due to project schedule pressure, leading to missed deficiencies that are costly to fix later
Applicable Standards
| Standard | Clause | Relevance |
|---|---|---|
| EN 54-16:2008 | Clause 5 | Voice alarm system commissioning and STI measurement requirements |
| BS 7443:1991 | Clause 8 | Sound systems for emergency purposes commissioning procedures |
| IEC 60268-16:2020 | Clause 7 | STI measurement procedures for installed sound systems |
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Design-Time Companion
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