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dB C weighting is nearly even over all frequencies. db A weighting concentrates on the middle frequencies, and has most of the low end and some of the high end rolled off. The intention is to make a scaled that relates to the sensitivity of the typical human ear, which is most sensitive in the middle ranges. A weighting is used predominantly by OSHA to determine potential for ear damage. The weighting has nothing to do with high or low sound levels.

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