dB HL (hearing level) is not the same as dB SPL (sound pressure level), which is an absolute measure of the pressure generated by sound wave. Thresholds are measured on a decibel (dB) hearing loss (HL) scale referenced to audiometric"zero" (the average hearing level at each frequency for normal young adults). Moreover, dB allows a realistic modelling of human auditory perception, since the ear reacts to relative changes in noise level. dB HL and dB SPL. dB SPL is a comparison of a sound level to what was thought to be the threshold of hearing, although today it is known that the value was too high. Hearing levels are measured with pure tones at different frequencies and the hearing level of an individual will vary depending on the frequency chosen. dB HL is determined by conducting hearing tests among a large test group to determine the "equal loudness curve" and … 10 db HL would be 10 dB SPL lower and so on. (Okay, just kidding.) The value of a dB depends on the context in which it is used. Mild hearing loss You may hear the conversation or the speech. 0 dB HL is what normal hearing is defined as. level 2. It's measured with pure steady tones, same as dbHL. The number of select frequencies tested can vary upon the age of the person tested, the reason for the test, and the time allotted for testing. Physically, every 6 dB increase represents a doubling of sound pressure level. Perceptually, every 10 dB increase sounds twice as loud. Moderate: between 41 and 54 dB HL. Statistically speaking, 15 dB HL is a conservative cutoff for normal variance around the mean of 0 dB HL for normal hearing and higher would be considered statistically significant by most statistical designs. dB HL dB hearing level is used in audiograms as a measure of hearing loss. Therefore, pure tone audiometry testing usually concentrates on the frequencies represented in male and female human voices, namely 250 – 8000 Hz. Totally Deaf: Have no hearing at all. Speech sound components can be represented from 125-8000 Hz depending on the speaker. One traditional PTA measure is the speech frequency average of thresholds at 500, 1000, and 2000 hertz (Hz). Original Poster 2 years ago. Report Save. For example, dBm means that the reference variable is the milliwatt; dBV, the volt. So 0 dB HL would be the minimum treashold of hearing for an average healthy male adult. Also, the opposite, someone with thresholds at < -15 dB HL should be recognized for super hearing! I hope this helps :) 3. share. -5 dB HL would be 5 dB SPL higher than average. The threshold of hearing is plotted relative to a standardised curve that represents 'normal' hearing, in dB(HL). Profound: 91 dB HL or greater. Severe: between 71 and 90 dB HL. The decibel (dB, or dB HL) is a logrithmic scale. [citation needed] dB Q dbA at 0 phon is exactly this. Here are some examples of different sound intensities as expressed in dB(HL): 180 dB: Rocket at take-off 140 dB: Jet engine at take-off 120 dB: Rock band 110 dB: Loud thunder 90 dB: City traffic 80 dB: Loud radio 60 dB: Ordinary conversation 30 dB: Soft whisper In many cases, dBs are followed by a suffix to define a reference variable. Moderately severe: between 55 and 70 dB HL. dB SPL is a comparison of a sound level to what was once believed to be the threshold of hearing, although today it is known that the value was too high. Hearing Level (HL) dB HL is used to refer to the hearing ability of a person and gives a statement about the severity of the hearing loss. The reference level varies with frequency according to a minimum audibility curve as defined in ANSI and other standards, such that the resulting audiogram shows deviation from what is regarded as 'normal' hearing. But soft sounds are hard to hear such as the voice of baby. 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