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Would it be better to try to match the diffusers they recommend?
Strangely enough, most manufacturers tend to recommend the products that
they make and have in stock! I wonder why...

It would be unusual to see Auralex recommending that you should NOT buy their product, and should instead buy something from GIK or Real Traps...
So take manufacturer's recommendations with a large grain of salt! That's one of the reasons why John does NOT allow any advertising or endorsement of acoustic products or manufacturers on the forum. And curiously enough, we do have forum members who work for many manufacturers, and offer very helpful advice to other members... but they carefully refrain from promoting their own products, which is a good thing.
Rather than going with what a manufacturer recommends on his website, it would be better to do the research and testing to see what YOUR room actually needs, and then either buy or design treatment that is suitable for THAT situation. In other words, figure out what YOUR drums need in YOUR room, and build the right thing. Do you even know for sure that you need diffusion? Or are you just following the suggestion of a manufacturer, who just happens to sell the very expensive device that he says you need?
Don't get me wrong: maybe the recommendation is correct, and you really do need diffusion in that range.... but then again, maybe not!
What problems are you having in your room, that make you think you need diffusion? What's wrong with the room? When you play your drums in there, what is it in the sound you hear that annoys you, upsets you, or just doesn't sound quite right? If you can explain that clearly, then perhaps we can point you in the right direction. So start by providing the details of your room, such as dimensions, shape, purpose, existing treatment, layout, problems, etc. Try to be clear about what the drums sound like, and what you feel is wrong with that sound, such as "the kick sounds "boomy" and dull", or "there's no "snap" to the snare, and it sounds muted" or "the toms sound "thin" with not much detail, and lack "punch"". (Of course, I'm assuming that you have a decent kit, with quality elements, and good tuning)...
However,
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- Stuart -