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DIY Distortion Analyzer/Analysis? | diyAudio
https://www.diyaudio.com/community/threads/diy-distortion-analyzer-analysis.1565/
Their ADC-216 has only a 166 kHz bandwidth, but its 16-bit dynamic range and Spectrum Analyzer function makes it useful for looking at distortion products. The software will also calculate THD, S/N, and other standard specs from captured waveforms. At around US $700, it doesn't look cheap until you compare with something like the AP System One.
HOWTO - Rockford Fosgate
https://www.rockfordfosgate.com/rnt/rnw/docs/1055/2012_rftech_diydistortionmeter.pdf
Assembly Instructions 1. Disassemble 1/8” plug and RCA jack. 3. Prepare and trim heat-shrink tubing to proper length. 4. Trim red and black 20 AWG wires to approximately 20” length. 6. Solder resistors in place and trim off excess leads. 9. Solder wire leads and reassemble RCA shell. R1 = 10k Ohm, 1/8 Watt R2 = 100 Ohm, 1/8 Watt
DIY Distortion Analyzer/Analysis? | Page 8 | diyAudio
https://www.diyaudio.com/community/threads/diy-distortion-analyzer-analysis.1565/page-8
The first USB sound card I purchased, an M-Audio Transit USB, measures about -90db. Better, but still not great. The newest sound card I purchased, a Behringer UCA-202, measures around -110db with one weird -100db peak at 600hz.
Build A High Performance THD Analyzer Part 1
https://www.proaudiodesignforum.com/images/pdf/Build_A_High_Performance_THD_Analyzer_Bob_Cordell_Audio_Part_1_July_1981.pdf
ANALYZER PART ONE ROBERT R. CORDELL RANGE 2K 20K he Total Harmonic Distortion (THD) analyzer is probably the most widely used instrument for evaluation of distortion in audio systems. Unfortunately, those analyzers which are good enough to evaluate contemporary equipment generally cost in the neigh- borhood of $2,000. Because of a care-
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