Corner-Specific Design (4-Pack) — Multi-faceted corner acoustic foam (4 × 4 × 9 inches), designed for sound treatment applications.

If you are seeking the ultimate balance between acoustic diffusion and absorption, this 4-pack of multi-faceted corner foam blocks is well worth your consideration. Each block measures 4 × 4 × 9 inches; rather than a simple triangular or wedge shape, their exterior features an irregular polyhedral form composed of multiple distinct cut surfaces. They are manufactured using medium-density polyurethane foam (approx. 22 kg/m³), and the surface has undergone a dust-resistant treatment to prevent crumbling or shedding. The advantage of a multi-faceted design is that when sound waves strike from various directions, they are broken down into multiple low-angle reflected waves; simultaneously, the foam body absorbs the majority of the energy, thereby preventing the occurrence of singular, mirror-like reflections in the room’s corners. Each package contains four pieces; we recommend installing them in the four upper corners of a room, or stacking them to increase absorption depth. This design is particularly well-suited for acoustic testing environments, high-end gaming rooms, or small podcast recording studios. Installation is flexible, allowing for secure mounting using non-marking adhesive tape or specialized hooks. Once you experience the results, you will notice a significant improvement in both sound localization and spatial clarity.