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AES E-Library » Correlation of Audio Distortion Measurements
https://www.aes.org/e-lib/browse.cfm?elib=3296#:~:text=INTRODUCTION%3A%20Distortion%20in%20audio%20equipment%20is%20presently%20measured,standardized%20intermodulation%20distortion%20measurement%20method%20%28SMPTE-IM%29%20%5B1%20%5D.
Audio Distortion Measurements - Brüel & Kjær
https://www.bksv.com/media/doc/BO0385.pdf
Distortion is a relative measurement, usually referenced to the linear por tion of the output signal both in ampli tude and frequency. For example, total harmonic distortion (THD) is usually described as a percentage of the power sum of all the harmonics to the power sum of all the harmonics plus the fun damental (i.e. amplitude normaliza tion).
DISTORTION MEASUREMENT IN AUDIO AMPLIFIERS
https://renardson-audio.com/distortiontest.pdf
Total harmonic distortion (t.h.d.) measurements can be made using a distortion factor meter, which is basically a variable frequency notch filter. A low distortion sine wave is applied to the input of the amplifier being tested and the output fed to the input of the notch filter, which is adjusted to eliminate the frequency of the test signal.
A DIY approach to distortion measurements for audio ...
https://enjon.uk/2019/09/01/a-diy-approach-to-distortion-measurements-for-audio-amplifiers/
You can perform a ‘loopback’ test to measure the harmonic distortion of your own audio interface by connecting an RCA cable between the output and input and using REW to generate a 1kHz tone (use the generator icon on the main window). It is worth calibrating your device in the soundcard preferences panel before commencing testing.
Sound & Audio Measurement - Audio Distortion Analyzer
https://troutunderground.com/Sound-Audio-Measurement-Audio-Distortion-Analyzer/
Here is a Beautiful Vintage 1979 Sound Technology Model 1701A Ultra-High Performance Audio Distortion Measurement System with Manuals. Model 1701A. Serial# 106-01706 with Option 003(Automatic Set Level) 004(Intermodulation Distortion Analyzer) Measure.002% distortion in less than 5 seconds. Measure AC voltage with 2% accuracy.
Sound & Audio Measurement - Distortion Measurement System
https://troutunderground.com/Sound-Audio-Measurement-Distortion-Measurement-System/
Here is a Beautiful Vintage 1979 Sound Technology Model 1701A Ultra-High Performance Audio Distortion Measurement System with Manuals. Model 1701A. Serial# 106-01706 with Option 003(Automatic Set Level) 004(Intermodulation Distortion Analyzer) Measure.002% distortion in less than 5 seconds. Measure AC voltage with 2% accuracy.
Guest Video - Karl Adams - Audio Distortion …
https://www.youtube.com/watch?v=vwAhHz7Zpzk
In this guest video Karl Adams shows us how to measure low levels of distortion in audio circuits. The example used is an LM1875 in a compound configuration....
Audio distortion measurement techniques - Page 1 - …
https://www.eevblog.com/forum/projects/audio-distortion-measurement-techniques/
Distortion can be measured using the residual method (ie. a practically perfect (very, very low noise, distortion and other spurious signals) sine generator and a similarly perfect frequency/phase-locking notch filter followed by a RMS converter), which was fairly common and has been implemented many times.
Using Sound Cards for Audio Measurement - Audio Precision
https://www.ap.com/blog/using-sound-cards-for-audio-measurement/
Many audio measurements do not require the exceptionally low self-noise, high input voltages, or vanishingly small distortion available from APx hardware analyzers. For example, to conduct quality control of speakers on a manufacturing line, you typically need to make measurements from about 80 to 114 dBSPL.
Howto - Distortion Measurements with REW | diyAudio
https://www.diyaudio.com/community/threads/howto-distortion-measurements-with-rew.338511/
So now connect your audio source to your amp, connect your amp to your dummy load, connect your audio interface to the dummy load, and connect a DVM to the dummy load and set to AC volts. Increase or decrease the amplitude of the 1kHz sine wave until the DVM reads 2.83vac. That’s same as 1w into 8ohms.
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