What do you put inside diffusers?

DD83

New member
Hi everyone. I have a couple diffusers (12) I was planning on putting up. I was wondering what if anything these are usually filled with, i.e. insullation, etc.? Also best placement for these. Thanks for any useful input.
 
If they are molded plastic then I would fill them with something dense like insulation or mineral wool to help absorb low frequencies.

Hollow diffusers are a strange animal. It is my belief that they reflect (or rather, refract) high frequencies, they exaggerate their own resonant frequency, and they are too small and lightweight to affect low frequencies. I would attempt to muffle them (similar to muffling a drum head) using duck tape or something similar on the inside surface. Then I would add porous density to the remaining air space inside.

They are used to reduce direct reflections which contribute to blurring, doubling, or comb filtering. Generally the rear wall of a control room is the best candidate to start with, although any wall or ceiling can benefit from diffusion.
 
Thank you. VERY helpful. I wonder why I didn't receive an email that this post had a reply???
 
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