Simple Explanation

A solid surface like a wall that reflects or obstructs sound waves.

Concise Technical Definition

A boundary is a physical surface or object—such as a wall, floor, or ceiling—that impedes or reflects sound waves, causing changes in pressure and wave behavior at the interface.

Layman-Friendly Analogy

Like shouting into a wall—some of your voice bounces back or builds up against it.

Industry Usage Summary

In audio design, boundaries play a major role in how sound reflects, diffuses, or amplifies in a space. Speaker placement relative to boundaries can drastically impact bass response, imaging, and overall tonal balance.

Engineering Shortcut

Boundary = surface that reflects or alters sound wave behavior.

Full Technical Explanation

A boundary refers to any large, solid surface (e.g., wall, floor, ceiling) that interacts with sound waves by reflecting or impeding them. At a boundary, sound pressure builds due to reflection, creating standing waves or reinforcement in low frequencies. Proper acoustic treatment and strategic speaker/listener positioning are essential in managing boundary effects in room acoustics.