SPHR 4/588 - Advanced Audiology
dB HL Tutorial

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However, at 1000 Hz. the individual's threshold of 35 dB SPL is higher than the average normal threshold (i.e., 7.5 dB SPL) by nearly 28 dB. This indicates that I needed to make the 1000 Hz. pure tone louder by 28 dB before my patient could hear it suggesting that this patient's hearing differs from the average normal hearing at this frequency by nearly 30 dB.