What an amplifier trades for its efficiency, why published power ratings are so often meaningless, and the fact that reverses most people's instincts — an underpowered amplifier destroys far more tweeters than an overpowered one ever has.
A power amplifier takes a line-level signal — a voltage swinging by a volt or two, capable of supplying almost no current — and produces the same waveform with enough voltage and current behind it to force a loudspeaker's voice coil to move.
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