What is the meaning of 'dB SPL'?

The term 'dB SPL' stands for "decibels sound pressure level," and it specifically refers to a logarithmic measurement of the pressure of sound relative to a reference value. The correct answer encompasses both the measurement unit (decibels) and the context (sound pressure level) that indicates it is a relative measure based on physical properties of sound.

In this context, the reference value mentioned, 0.0002 dynes/cm², is a specific threshold that defines 0 dB SPL, which represents the softest sound that can be perceived by the average human ear at 1 kHz. Thus, the correct interpretation of 'dB SPL' emphasizes both the unit of measure (decibels) and its application to sound pressure level.

Understanding this concept is essential in various aspects of audiology and hearing instrument fitting, where precise measurements are critical for evaluating and addressing auditory needs.