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High fidelity—or hi-fi or hifi—reproduction is a term used by home stereo listeners and home audio enthusiasts (audiophiles) to refer to high-quality reproduction of sound to distinguish it from the poorer quality sound produced by inexpensive audio equipment, or the inferior quality of sound reproduction characteristic of recordings made until the late 1940s. ideally, high-fidelity equipment has minimal amounts of noise and distortion and an accurate frequency response.