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A headphone amplifier is a dedicated device that boosts an audio signal to power headphones, improving sound quality, clarity, and volume, especially for high-impedance models that standard devices can't drive properly. It takes a weak line-level signal and increases its amplitude to provide the necessary voltage and current to make headphones perform at their best. Some external headphone amplifiers also feature a built-in digital-to-analog converter (DAC) to convert digital sources like a computer's USB output into a high-quality analog signal.
Purpose: To increase the power of an audio signal to drive headphones, which is essential for high-end or high-impedance models that are power-hungry.
Function: It amplifies the signal to deliver more power, which results in clearer sound, better dynamics, and increased volume.