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(MXFA or MXSA, denoted by the symbol LAFmx or LASmx, respectively): The maximum, A-weighted sound level associated with a given event. Fast exponential response (LAFmx) and Slow exponential response (LASmx) characteristics effectively damp a signal as if it were to pass through a low-pass filter with a time constant (•) of 125 and 1000 milliseconds, respectively.

Source: http://www.volpe.dot.gov/acoustics/docs/1990-1999/1999-1.pdf

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