> Can someone break these down to the simplest level for me <
There are several common acoustic problems, and diffusors can help some of them. Flutter echo and comb filtering at mid and high frequencies can be avoided by either diffusion or absorption. But bass problems are helped only by absorption.
Diffusion is used instead of absorption when you want to control flutter echo and comb filtering, but don't want to make the room any more dead sounding. In a smaller room you usually need to make it more dead sounding, because small room ambience is bad ambience. So absorption is more suitable for small rooms.
Most rooms are too live generally anyway, so absorption makes more sense in most cases. Diffusion in a few key places can be a nice touch in larger rooms though.
--Ethan
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