SPL

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    stands for: Sound Pressure Level
    1. A measurement of acoustic energy or pressure (I.e. the greater the sound pressure the louder the signal)
    2.
    dB SPL is the most common way of measuring the volume of sound in the open air. 0dB equals the threshold of hearing, 60 dB is the average level of talking, and 120 dB is the threshold of pain.

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