Select Frequency (Hz): 1000 Hz

0 dB

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What This Means: We don't hear all frequencies at the same perceived loudness. 1kHz (1000Hz) is the base for the level loudness measuring. If you see a negative number then it's lower than 1KHz frequency and if positive then it's perceived louder.

 

Every 3dB is a noticeable drop in level and 10dB is a doubling of either quieter or louder depending on if the value is positive or negative.