What is defined as the magnitude of an acoustic event measured in the ear canal?

The magnitude of an acoustic event measured in the ear canal is referred to as intensity. Intensity quantifies the power of the sound wave per unit area, often expressed in decibels (dB). It reflects how much energy is transmitted through the medium (in this case, air) at a given point, which can be perceived as loudness by the human ear.

Frequency describes the number of cycles of a sound wave that occur in one second and is measured in hertz (Hz). It pertains to the pitch of the sound rather than its intensity. Amplitude is a term used to describe the maximum extent of a vibration or oscillation, usually within a sound wave's graph, but it does not directly quantify the acoustic event as perceived in terms of intensity. Volume is more commonly understood as the subjective perception of loudness, which can be influenced by intensity but is not a direct measurement. Therefore, the most precise term related to the magnitude of an acoustic event in the context of sound measurement in the ear canal is intensity.