Which of the following statements about dBHL is true?

The statement regarding dBHL, or decibels Hearing Level, being accurate is based on how it serves as a calibration system for measuring sound intensity in relation to a standard reference point. Specifically, dBHL defines the threshold of hearing for average young adults, which is set at 0 dBHL. This means that sounds measured in dBHL denote how far above or below this standardized threshold a particular sound is.

In practical terms, when audiologists perform hearing tests, they compare an individual's hearing sensitivity to this established reference point, allowing for a standard measurement that can be uniformly applied across different individuals and situations. As a result, dBHL provides a framework that enables effective communication about hearing levels among professionals and can better facilitate the identification and treatment of hearing disorders.

The other statements do not accurately describe dBHL; for example, it is not merely a measure comparing sound pressure to power, or a physical measurement of sound amplitude, nor is it defined in relation to a fixed ratio of 20 micropascals (uPa), which is typically more relevant in discussions of sound pressure levels (SPL) rather than dBHL itself.