In audio, Signal-To-Noise Ratio (S/N) is a ratio of sound to background noise. The larger the ratio, the more the desirable sounds (music, voice, effects) are separated from acoustical effects and background noise. In amplifier specifications S/N ratios are expressed in decibels. A S/N ratio of 70db is much more desirable than a S/N ratio of 50db. A 100db S/N ratio is considered excellent.
For additional terms and definitions, check out my Home Theater Glossary
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