why is a preamplifier needed in an audio amplifier?

why is a preamplifier needed in an audio amplifier?

Audio amplifiers are fundamental components in audio systems, responsible for boosting weak electrical signals from audio sources to levels suitable for driving speakers or headphones. While many audio amplifiers integrate both preamplifier and power amplifier functions into a single unit (known as integrated amplifiers), dedicated preamplifiers continue to be essential components in high-quality audio systems. …

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