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Hypothesis: A/B crossover distortion

is particularly audible in 3.x series.

Larger A/B amps put the crossover at a higher power level.

I tested an approximately 120 WPC AB amp, similar class D amp, and a more powerful class D amp which I use now.

The AB had a small but noticeable distortion or harshness in violins in louder passages (similar most sensitive hearing range of 2-3kHz again).

The two class D's did not. One sounded though somewhat rolled off or truncated in the very highest frequency. The final one was perfect---NAD M22 with nCore technology.

Siegfried Linkwitz: "In Class A/B power amplifiers the time variant and amplitude dependent crossover distortion is more harmful than harmonic distortion, because of its impulsive and thus wideband nature. It does not register in the typical high signal level harmonic distortion specification. Crossover distortion changes with bias conditions and is thus a function of the thermal control loop of the amplifier. It must be tested dynamically as output power switches from high to low levels and device temperatures change."



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  • Hypothesis: A/B crossover distortion - DrChaos 03/31/1814:47:25 03/31/18 (0)
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