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Old 6th May 2020
Deleted 56021e5
In fact adding diffusers to a live space with flat reflective walls/ceiling will actually LOWER the RT60, not increase it !

This is not perceptible in small room acoustics but it is in large room acoustics.

The explanation is quite simple

a) Diffuse reflection spreads reflections to more surfaces

b) Most diffusers have some sort of absorption when compared to a flat wall.

As a reading I would suggest

That is why using typical Sabine equations or other numerical approaches fails to predict RT60 in most spaces, particularly with uneven absorption and the main reason we use CATT as a modelling tool at our office.