High fidelity or hi-fi reproduction is a term used by home stereo listeners and home audio enthusiasts (audiophiles) to refer to high-quality reproduction of sound or images that are very faithful to the original performance. Ideally, high-fidelity equipment has minimal amounts of noise and distortion, and differents kinds of distorsions, an accurate frequency response, and others sound defects as set out in 1973 by the German Deutsches Institut für Normung (DIN) standard DIN 45500. In theory, only stereo equipment that met the standard could bear the words 'hi-fi', but in practice, the term was widely misapplied to audio products that did not remotely approach the DIN basis specifications, as a By the 1990s, the term hi-fi for expensive high-quality home-audio electronics was largely replaced with high-end audio.
