Skyline diffuser I made myself from solid cedar. It's probably too small relative to the size of my theater, but I think it helps with acoustics and looks great. Wasn't sure if
Skyline Sound Diffuser. Made to Order - Etsy UK
Skyline Diffusers | LA Sound Panels
Finish And Mount The Skyline Diffuser
Skyline Diffuses by Perfect Acoustic: 60x60x15cm, 12kg