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Ultra low distortion composite amplifier kits TDA7293 TDA794

https://www.kaltecs.com/tda7293-composite-amplifier/

Both amplifiers have similar very low THD and noise. At very low power (0.5 – 1.0W) it is really difficult to find any difference. Increasing the output power (5-10W) however makes some sight differences visible (hearable). Blind tests pushed the scale a little bit in favor of TDA7293 composite but not in all genres of music.

A Low THD Class-D Audio Amplifier with Harmonic Reduction

https://oaji.net/articles/2017/1992-1525435871.pdf

differential DLDPC PWM class-D audio amplifier feature a total harmonic distortion is lower than 0.01% with an output voltage swing of +or− 5V. Keywords − Class-D, dual-level dual-phase carrier, DLDPC PWM, PSCPWM, MLCPWM, THD, IMD.

4QD-TEC: Low distortion Audio amplifier

https://www.4qdtec.com/pwramp.html

Low distortion audio amplifier This is an unusual circuit for an ultra-low distortion power amp. According to my original notes the circuit is dated January 1977 so the circuit is not exactly modern but it is still sufficiently different to be interesting.

Best Budget Stereo Amplifiers in 2021 | Affordable Stereo …

https://musicgadgets.net/best-budget-stereo-amplifiers/

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Total Harmonic Distortion (THD): Is It a Good Indicator of ...

https://www.audioholics.com/loudspeaker-design/audibility-of-distortion-at-bass/total-harmonic-distortion-thd

By James Larson — August 13, 2015. Harmonic distortion is often stated as a measurement called Total Harmonic Distortion, or THD, which is a percentage of the overall signal composed of harmonic distortion. THD is not a good indicator of how audible harmonic distortion will be unless it is of an extremely high or extremely low value.

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