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  1. The difference between the nominal or maximum operating level and the noise floor in dB.
  2. The range or distance between the noise floor (the noise level of the equipment itself) and the music signal. Source: http://www.owenscorning.com/around/sound/glossary.asp
  3. The ratio between the nominal level of a signal (0 dBm) and the general circuit noise level (noise floor) measured in dB. All electronic devices produce noise. The S/N ratio is a measure of how quiet the device is by indicating how low the level is of the inherent noise. Source: Church Audio & Acoustics Glossary

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