Perfectly diffuse rooms are a common staple of acoustics labs in university and calibration facilities, it's a requirement for STC (sound transmission class) testing for building materials and wall/window assemblies.
Any acoustically well-designed movie theater (THX or HPS-4000 certified among others), performance space, concert hall or auditorium will be decently diffuse, at least at higher frequencies.
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Okay, but are perfectly diffuse rooms really more common than perfectly absorbent rooms?
Anyway, I didn't know that before today :)
Perfectly diffuse rooms are a common staple of acoustics labs in university and calibration facilities, it's a requirement for STC (sound transmission class) testing for building materials and wall/window assemblies.
Any acoustically well-designed movie theater (THX or HPS-4000 certified among others), performance space, concert hall or auditorium will be decently diffuse, at least at higher frequencies.