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While wave amplitude is the primary determinant of loudness, the perception of a sound's volume is also influenced by its frequency. This interaction means that not all frequencies are perceived equally, even at the same amplitude. For instance, a very low-frequency sound wave, such as one at 10 Hz, remains inaudible regardless of its amplitude. In contrast, for a sound within the typical audible range, like a 1000 Hz wave, variations in amplitude result in significant changes to its perceived loudness.

Interaction Between Frequency and Amplitude in Loudness Perception

An audio engineer is comparing two sound waves. Sound Wave A has a very large amplitude but a very low frequency of 20 Hz. Sound Wave B has a smaller amplitude than Wave A, but its frequency is 1000 Hz. How will a person with typical hearing most likely perceive these two sounds?

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