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 Diffusers: The Ultimate Guide | TSP
From you – Diffuser Calculator
Acoustic Skyline Sound Diffuser Diffusor Wood Studio Treatment - Etsy
Diffuser Calculator – The first mobile app for this purpose!
How to Build an Acoustic Diffuser — And Why You Need Diffusion – Flypaper