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Original Message

dBa vs dBc

Posted by Steve O on March 22, 2009 at 12:26:35:

Briefly, dBa and dBc involve frequency response weighting or contouring by the sound level measuring device.

dBa more-or-less simulates the response of the ear by de-emphasizing the low and high end frequencies and emphasizing the midrange. One use of the dBa weighting was to evaluate the potential for noise induced hearing damage in a working environment because of the way it simulates human hearing (don't know if it's still the standard of the law). dBc is much flatter in response but still has rolloff in the lowest and highest frequencies because it allowed mfg of cost effective sound level meters with reasonably flat freq resp. dBlin is flattest and extends from subsonic frequencies to well above human hearing with little variation. This weighting (lack actually) is expensive to achieve and is usually associated with lab equipment.