Auralex Auralex Studiofoam Pyramid Panels - 2 ft. W x 2 ft. L x 2 in. H - Purple (Half-Pack: 12 Panels per Box)

2 in. Studio foam Pyramids offer a bit of extra sound diffusion than 2 in. Studio foam Wedges. They also offer slightly less sound absorption. This means they yield a less dry-sounding space with a bit more air.