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An audiogram is a normalised conversion of hearing thresholds from dBSPL to dBHL, where dB is decibel, SPL is sound pressure level and HL is hearing level. Audiograms are set out with frequency in Hz on the horizontal axis, most commonly on a logarithmic scale, and a linear dBHL scale on the vertical axis. Normal hearing is classified as being between -10dBHL and 15dBHL, although 0dB from 250Hz to 8kHz is deemed to be 'average' normal hearing.
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