Power amplifiers electronically amplify low-power audio signals to a level suitable for driving loudspeakers. They are typically the final stage in an audio playback chain, and require a preamplifier to draw signal from.
Mono block and stereo power amplifiers are the typical heart of a multi-component HiFi system. Multi-channel amplifiers are generally used in home theatre and multi-room applications, where multiple channels of amplification are required.
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