MAGNITUDE
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33 dB |
The 40 phon curve (which crosses the 40 dB line at 1 kHz) dips again at 4 kHz to about 33 dB. This means you'd have to lower a 4 kHz tone by 7 dB to make it sound equally loud as the 1 kHz tone, which indicates that our hearing is more sensitive at 4 kHz. |