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(n.) An equalization method applied to the standard monaural track used for sound in film, also known as the N (normal) curve. It has changed little since becoming a standard in 1938. The response is flat between 100 Hz and 1.6 kHz. Response is reduced 7 dB at 40 Hz, 10 dB at 5 kHz and 18 dB at 8 kHz. The severe reduction of the high end of the spectrum conceals the high frequency crackling noise inherent in early film sound production.