The threshold of hearing is plotted relative to a standardised curve that represents 'normal' hearing, in dB(HL). Moderately severe: between 55 and 70 dB HL. I hope this helps :) 3. share. Severe: between 71 and 90 dB HL. An audiogram is a graph that shows the audible threshold for standardized frequencies as measured by an audiometer.The Y axis represents intensity measured in decibels and the X axis represents frequency measured in hertz. Speech sound components can be represented from 125-8000 Hz depending on the speaker. (Okay, just kidding.) dB HL and dB SPL. Mild hearing loss You may hear the conversation or the speech. [citation needed] dB Q Hearing levels are measured with pure tones at different frequencies and the hearing level of an individual will vary depending on the frequency chosen. Totally Deaf: Have no hearing at all. Profound: 91 dB HL or greater. Also, the opposite, someone with thresholds at < -15 dB HL should be recognized for super hearing! Perceptually, every 10 dB increase sounds twice as loud. 0 dB HL is what normal hearing is defined as. 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 Report Save. 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). dB HL dB hearing level is used in audiograms as a measure of hearing loss. dbA at 0 phon is exactly this. 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. Physically, every 6 dB increase represents a doubling of sound pressure level. 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. The decibel (dB, or dB HL) is a logrithmic scale. dB HL is determined by conducting hearing tests among a large test group to determine the "equal loudness curve" and … 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. 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. It's measured with pure steady tones, same as dbHL. But soft sounds are hard to hear such as the voice of baby. So 0 dB HL would be the minimum treashold of hearing for an average healthy male adult. 10 db HL would be 10 dB SPL lower and so on. -5 dB HL would be 5 dB SPL higher than average. For example, dBm means that the reference variable is the milliwatt; dBV, the volt. 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. Original Poster 2 years ago. level 2. Moreover, dB allows a realistic modelling of human auditory perception, since the ear reacts to relative changes in noise level. 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 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. 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