Additional frequencies generated by the audio device that were not present in the original signal. These can distort the sound.
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Harmonic distortion
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High Fidelity (Hi-Fi)
A term for high-quality audio reproduction where sound signals are reproduced with high accuracy and minimal distortion. It is often associated with stereo systems or audio equipment delivering natural and detailed sound.
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High-end audio
Audio systems and components of the highest quality, often employing particularly sophisticated and expensive technologies to achieve the best possible sound reproduction.