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Standard computer sound cards or integrated motherboard audio often lack the power to drive high-impedance headphones or large passive speakers effectively. An audio amplifier bridges this gap by taking the low-power "line-level" signal from your PC and boosting it to a level suitable for driving speakers.

High-end units, particularly Class A amplifiers , are considered the "gold standard" for maintaining sound purity and providing distortion-free signals. How to Connect Your Computer to an Amplifier particularly Class A amplifiers

Many modern amplifiers also act as a filter to restrict bandwidth and eliminate interfering noise from the computer's internal components. particularly Class A amplifiers