Cabinet Resonance is the natural vibration of a speaker box's structure in response to certain frequencies.

Just as a guitar has a soundbox designed to amplify the sound of the strings, a speaker box also has frequencies at which it "likes" to vibrate. However, in a speaker box, this resonance is undesirable.

When the cabinet vibrates, it adds its own "color" to the sound, interfering with the faithful reproduction of the audio.

The main problem is time smearing:

• The cabinet stores the vibration energy and releases it slowly.

• This transforms fast, percussive sounds (like a "tuk" from a bass drum) into a prolonged, muffled sound ("boom").

To combat this problem, manufacturers use various techniques to make the cabinets as inert as possible, such as the use of bracing to stiffen the structure and damping materials to absorb vibrations.