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Where to connect that black loudspeaker wire

One wrong way is to connect it to the midpoint of the capacitor bank in your power supply.

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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

Distortion rising with power, not with frequency.

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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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