SPL measurements are made with instruments which respond to all frequencies in the audible range; but since the sensitivity of the ear varies with both frequency and level, the SPL does not accurately represent the ear's response. This condition is corrected by weighting characteristics in sound level meters.
Weighting networks modify the frequency response of the instrument so that its indications simulate the ear's sensitivity. One, for A weighting, gives readings representing the ear's response to sounds near the 40 dB level; another, B weighting, approximates the response of the ear at about 70 dB values, and C weighting is used for levels near 100 dB or higher. Readings taken with these weightings are
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