The Secondary Residue Diffuser effectively avoids sound focusing. When sound waves are reflected from a flat reflection panel, all the sound energy will be reflected in the same direction, with a fixed reflection angle determined by the position of the sound source. However, when sound waves are reflected from the surface of a secondary residue diffuser, the sound energy is dispersed in different directions with varying phase differences.

The irregular reflections formed by the dispersed energy create a subjective sense of spatiality for the human ear. When used for diffusion in the mid-to-high frequencies, it enhances the "brightness" of the sound. The reflection direction of the secondary residue diffuser is roughly a half-circle, ensuring even sound diffusion. Additionally, the secondary residue diffuser has another effect. When the reflecting surface is a secondary residue diffuser, the sound waves disperse in a semi-circular direction, resulting in countless different frequency bands converging at the listening position. This expands the listening area invisibly.

The secondary residue diffuser not only disperses sound energy, preventing echo and standing waves but also improves the brightness of the sound. When combined with absorptive materials in the early reflection paths, it significantly improves sound quality.