The sine wave tone is used to set the electrical output level throughout the signal path, right up to the point you get to the speakers. The common calibration levels are listed below:Īll test signals are recorded at –20dBFS including the 1 kHz sine wave tone. For more information about the LFE channel, follow this link. Since the LFE channel is not calibrated as a separate entity, the LFE gain will not affect system calibration. *Also note that the LFE channel gain in 5.1 formats varies from 0 to +10 dB depending on the encoding format used. Please note that the bandwidth limited signals that have been provided, limit many of the room interaction affects often associated with measuring SPL and broadband pink noise. The reference SPL level however can vary based on the delivery media and speaker type. Since most recording media is now digital, the reference electrical signal level is usually –20dBFS with 20dB of headroom. The purpose of calibration is to adjust the overall electro-acoustic system gain so that 0dBVU of electrical signal level equals a certain acoustic level at the listening position.
If you are using a CD / CD player use only one channel of the CD player. Please make sure you hard assign them to the left and then the right, not both channels at the same time. Pink Noise full bw -20dBFS.wav – a full-bandwidth pink-noise file recorded at – 20dBFS.500-2.5kHz PINK NOISE -20dBFS.wav – a 500Hz to 2500Hz bandwidth limited pink-noise file recorded at -20dBFS.40-80Hz PINK NOISE -20dBFS.wav – a 40Hz to 80Hz bandwidth limited pink-noise file recorded at -20dBFS.1000Hz SINEWAVE -20dBFS.wav – a 1kHz file recorded at -20dBFS for electrical calibration.SPL Meter – such as the SPL meter sold by RadioShack in the U.S.Once downloaded, either burn the test files on to a CD or import them into your DAW and follow the instructions below. To download the zip file, “Right Click” and select “Save Target As” and the file will begin downloading, or click the link at the foot of the page. Instructions for electro-acoustic calibration of 2.1 and 5.1 audio systems using an SPL meter and Blue Sky’s test filesīefore starting, download the BlueSkyTestFiles.zip (15 MB). Additionally, the crest factor on the 40 to 80 Hz test file has been reduced to help improve accuracy when measuring this test signal with a SPL meter. Changes include reduced hum & distortion, which although it didn’t negatively impact the accuracy of the previous version of the test files, the noise was somewhat annoying.
Note: The calibration test files, available for download on this page, have recently been updated and improved.
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