DIY Acoustic Diffusers

Thanks Bish and Albert.

Albert, doesn't foam act as an asborber? I would think you'd need something harder and more reflective like ABS plastic or wood. Where do you find a hotwire cutter?

albertporter
Is there a plan you used to determine the configuration of your diffusors? Also you indicated they were foam, what size foam pieces did you start with?

I use a DIY hot wire foam cutter with a beefy variable voltage dc power supply. Just Google "building a hot wire foam cutter," you'll get a load of sites telling you how to do it.

You could hunt around the [ decware.com ] site they have a kit for diffusors not to much money. Marc

How about this site for reference:

http://www.mhsoft.nl/diffusor.asp#calcul

Also, the Auralex metrofusers aren't hugely expensive, but they need to be covered somehow since they are made of Styrofoam and are butt ugly on their own. They are not based on the formula above though. They have varied widths as well as depths.

http://www.auralex.com/sound_diffusor_metrofusor/sound_diffusor_metrofusor.asp

Lastly, simply PVC tubes might be an option, but there is no real data to support them. Perhaps look up "room lenses" and you'll find something. The room lenses could also be seen as helmholtz resonators too...but I am no acoustician - that I am certain about!