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How to Conduct Speaker Stability Checks

All testers must conduct a speaker stability check with each of their speakers at least every 2 years. This is to ensure the output level of the speaker does not change during the test, which would impact the overall result.

The process for conducting the stability check is as follows:

SITMA Members can use our template to enter their data in and submit their Speaker Stability Checks

Our current issue is: Issue 2.4 – 1st April 2024

Click Here to How to Conduct Your Speaker Directivity Checks
1
In a room with a volume of at least 30.0m3, position the microphone on a tripod 1.5m away from the speaker, to ensure diffuse field conditions, and 1.0m away from all reflective or absorbing surfaces within the room.
2
Turn on and calibrate the sound level meter using the calibrator.
3
Ensure the sound level meter is set to measure from 50Hz to 5000Hz as recommended by SITMA, but at least 100Hz – 3150Hz as an absolute minimum.
4
Turn on the speaker, selecting pink noise, and turn up to the normal sound level expected during the sound insulation test (circa 100dB at all frequencies between 100 and 3150Hz). Note that this is usually ‘max’ volume.
5
Starting within 10 seconds of the speaker being turned on, take a minimum of 18 ‘L1’ source room readings, each lasting between 10 seconds, with a gap no more than 5 seconds between each reading.
o The gap between readings may be 0.0 seconds (using data logging).
o The total measurement time shall be at least 180 seconds.
o Ensure measurements are taken ‘static’ (i.e. the microphone is not moving during the measurement).
6
Turn off the speaker and wait 120 seconds.
7
Turn the speaker on and repeat the 18 measurements as above.
o Remember to start your measurement within 10 seconds of the speaker turning on.
8
You should now have a total of 36 measurements across at least 6 minutes, with a gap of 2 minutes.
9
Export this data into the excel spreadsheet (FOS016) with column A being the date and time of each measurement, and columns B through to V being each of the third-octave frequency ranges between 50Hz and 5000Hz.
10
Ensure that your speaker meets the following requirements:
Frequency Range Maximum Distrubution Minimum Std Deviation
50Hz to 83Hz
No Requirement
No Requirement
100Hz to 3150Hz
No deviation greater than ±1dB
Standard deviation less than 0.5
4000Hz to 5000Hz
No Requirement
No Requirement
11
Upload the completed spreadsheet onto the SITMA Portal.

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