The range of loudness between the softest sound that a person can hear and the loudest sound they can stand (Uncomfortable Loudness Level). Hearing aids should be adjusted to keep all sounds within this range—although this is not always possible if you have a severely-collapsed dynamic range. The normal dynamic range is about 120 dB, while the dynamic range of a person with a severe or profound hearing loss may only be about 30 dB.
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