Mild hearing loss You may hear the conversation or the speech. 0 dB HL is what normal hearing is defined as. 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. Moderately severe: between 55 and 70 dB HL. The threshold of hearing is plotted relative to a standardised curve that represents 'normal' hearing, in dB(HL). dbA at 0 phon is exactly this. It's measured with pure steady tones, same as dbHL. Hearing levels are measured with pure tones at different frequencies and the hearing level of an individual will vary depending on the frequency chosen. Severe: between 71 and 90 dB HL. 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). Also, the opposite, someone with thresholds at < -15 dB HL should be recognized for super hearing! So 0 dB HL would be the minimum treashold of hearing for an average healthy male adult. 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. 10 db HL would be 10 dB SPL lower and so on. 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. Original Poster 2 years ago. 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. 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. In many cases, dBs are followed by a suffix to define a reference variable. 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. 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. But soft sounds are hard to hear such as the voice of baby. 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. One traditional PTA measure is the speech frequency average of thresholds at 500, 1000, and 2000 hertz (Hz). Profound: 91 dB HL or greater. Speech sound components can be represented from 125-8000 Hz depending on the speaker. Perceptually, every 10 dB increase sounds twice as loud. Moreover, dB allows a realistic modelling of human auditory perception, since the ear reacts to relative changes in noise level. Totally Deaf: Have no hearing at all. level 2. Report Save. dB HL dB hearing level is used in audiograms as a measure of hearing loss. -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. The value of a dB depends on the context in which it is used. (Okay, just kidding.) Therefore, pure tone audiometry testing usually concentrates on the frequencies represented in male and female human voices, namely 250 – 8000 Hz. Moderate: between 41 and 54 dB HL. dB HL and dB SPL. The decibel (dB, or dB HL) is a logrithmic scale. I hope this helps :) 3. share. 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