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Professional Definition

Deflection (most often in the context of: deflection arrow or displacement arrow) is a physical quantity that describes the maximum distance a point of an elastic element (e.g., a plate, membrane, string) or medium moves from its equilibrium position under the influence of force or vibrations.

In wave acoustics, this concept is closely related to amplitude of vibrations – the greater the displacement arrow of the medium particles, the greater the acoustic pressure and the louder the sound. In building acoustics, the deflection arrow of a ceiling or wall under static and dynamic load is critically important for the stiffness of the structure, and consequently – for its resonant frequency and acoustic insulation.

Acoustics in Simple Words

Imagine a taut bowstring. At rest, it forms a straight line. When you pull it, the distance between the loose string and its farthest point at the moment of pulling is the deflection. In the world of sound, it works similarly with a speaker membrane or a guitar string.

When you strike a string, it begins to vibrate, deflecting up and down. The maximum distance that the string