Test instrument: 4U2SET
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Serial number: 4A1329
During the test, the same height of the site was selected, and 6 points were evenly distributed as test points.
1. Play the sound source, use the RTA mode to measure 6 points, and store the RTA data of each point into the file, and upload the data to the PC. Open these data files and select the RTA values ​​corresponding to each test point frequency of 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500, 3150, 4000 Hz. Six sets of data are obtained for each frequency.
2. Calculate the average of 6 sets of data for each frequency. From these averages, the “measured room frequency response curve†of the measured site can be generated.
3. After the average value corresponding to each frequency is listed, the average of all frequency spaces (ie, the average of these average values) is calculated from these data. And subtracting all the frequency space averages from the maximum (small) value in the source data list, respectively, can obtain the transmission frequency characteristics of 125Hz-4000 Hz. The standard indicators are detailed in the sound reinforcement system.
4. The sound source with the playing frequency of 1000 Hz and 4000 Hz is measured at 6 points respectively. Find the maximum and minimum values ​​of the six sets of data for each frequency and calculate the difference. The difference between the two groups is averaged, and the average value obtained is the unevenness.
5. Measure the sound pressure output from the sound source (speaker) and the average value of the measured sound pressure at 6 points, and calculate the difference between the sound pressure of the sound source at each frequency and the sound pressure of the average value of the measuring point, that is, the sound of each frequency is obtained. Gain. Then calculate the average of all frequency sound gains to get the average sound gain of 125 Hz-4000 Hz.
6. Using the SLM mode, measure the average value of the background noise of the measuring point.
Using the data from the above test, the table is listed to produce a sound field test report for the test site.