Figure 6. Frequency weighting. An XY graph with Frequency, in Hertz, on the X-axis and type of Weighting relative to 1000 Hertz, in decibels, on the Y-axis. A dotted horizontal line extends across the graph at zero decibels. Three curves are shown - A, B, and C. Curve A originates at (20 Hertz, -50 decibels) and rises at 1000 Hertz to a maximum height of approximately 2 decibels above the dotted line and drops below the dotted line at 5000 Hertz. Curve A ends at (20,000 Hertz, -8 decibels). Curve B originates at (20 Hertz, -24 decibels) and rises to the dotted line at 300 Hertz and drops below the dotted line at 3500 Hertz. Curve B ends at (20,000 Hertz, -11 decibels). Curve C originates at (20 Hertz, -7 decibels) and rises to the dotted line at 70 Hertz and drops below the dotted line at 3500 Hertz. Curve C ends at (20,000 Hertz, 11 decibels).

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