Best Acoustic Diffusers

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Depth sets the lowest frequency a diffuser can scatter, and it is the number most listings bury. The thin molded panels at 1 inch deep, whether 12 x 12 inches or 19.7 x 19.7 inches, work on the top two octaves and effectively nothing below; a 2 inch grooved wood panel reaches lower, and the 3.25 inch deep units lower again. If your problem is flutter echo between two hard parallel walls, the shallow pyramids will help. If your problem is a boxy room with a strong slap back, no diffuser at any depth substitutes for absorption at first reflection points, and buying diffusers first is the usual mistake. Coverage is the second calculation and boxes are quoted in pieces, not square feet: eight 12 inch panels cover 8 square feet, sixteen cover 16, and twelve 19.7 inch panels cover roughly 32 square feet. Place them on the rear wall and the ceiling behind the listening position where you want energy scattered rather than removed, and leave the front of the room absorptive. Material changes durability and looks rather than performance at these depths: PVC is light, wipes clean and mounts with adhesive, while paintable wood is heavier, needs mechanical fixing and matches a room you have to live in. Neither is a bass treatment.