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Wiring an audio power amplifier

Use a balanced connection into a differential input were possible.  Wire any signal and its reference together at all times. Disregard grounding gurus.

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The measurements of an ideal audio amplifier for correct sound reproduction

The measurements of an ideal audio amplifier for correct sound reproduction

According to Vladimir Lamm of LAMM Industries, it is possible to predict the sound quality of a piece of audio equipment from measurements alone, without listening. Alas, it is not a single total harmonic distortion (THD) @1kHz number. Although the full measurement interpretation framework, based on Lamm's primary research, is proprietary, it is illustrated by the desired THD vs. frequency and power level of an amplifier for a faithful reproduction of the sound.  An ideal amplifier will exhibit constant THD vs. frequency at each power level; THD vs. power would show a gradual but unvarying rise in THD as power increases for each of test frequencies;...

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How much power is enough for an audio amplifier?

To play Sultans of Swing at the normal listening level requires an amp rated at 25W.

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Differential configuration for LM3886

Differential configuration for LM3886

Not only does differential configuration do away with ground loop problems, it also eliminates a significant source of distortion.

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Inverting configuration for LM3886

Inverting configuration for LM3886

Another option for a gainclone in the inverting configuration.

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