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An audio interface and an audio amplifier serve different purposes in audio signal processing.

1. Audio Interface: An audio interface is a device that connects an external audio source, like a microphone, guitar, or keyboard, to a computer. It provides preamps for microphones and instruments, as well as analog-to-digital and digital-to-analog conversion. The main purpose is to help capture high-quality audio into a computer for recording, editing, or live streaming.

2. Audio Amplifier: An audio amplifier, on the other hand, is designed to increase the power of an audio signal to drive speakers. It takes a low-power input signal and boosts it to a level that can adequately drive a loudspeaker. An amplifier serves to increase the volume of the audio signal, making it sound louder through the speakers.

Although both work with audio signals, they perform different functions in the