A standard for noise measurement that takes into consideration the human ear's sensitivity to certain frequencies. This is expressed as part of noise specifications and can be denoted by adding the letter 'A' to the spec - i.e. 15dBA.

10Hz	12,5Hz	16Hz	20Hz	25Hz	31,5Hz	40Hz	50Hz
-70,4dB	-63,4dB	-56,7dB	-50,5dB	-44,7dB	-39,4dB	-34,6dB	-30,2dB
63Hz	80Hz	100Hz	125Hz	160Hz	200Hz	250Hz	315Hz
-26,2dB	-22,5dB	-19,1dB	-16,1dB	-13,4dB	-10,9dB	-8,6dB	-6,6dB
400Hz	500Hz	630Hz	800Hz	1kHz	1,25kHz	1,6kHz	2kHz
-4,8dB	-3,2dB	-1,9dB	-0,8dB	0dB	+0,6dB	+1,0dB	+1,2dB
2,5kHz	3,15kHz	4kHz	5kHz	6,3kHz	8kHz	10kHz	12,5kHz
+1,3dB	+1,2dB	+1,0dB	+0,5dB	-0,1dB	-1,1dB	-2,5dB	-4,3dB
16kHz	20kHz
-6,6dB	-9,3dB

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