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I make my own out of bass wood.
I would suggest not using balsa. I have never had good success.. There are a couple of DIY wooden diffuser out there on the web, I have seen some pretty exotic ones.
I make mine by cutting with a fine toothed acrylic blade (because I am too lazy to change it), but anything with very little rake and alot of teeth (+80) i think should do. Remeber that this is a hardwood, even though it doesn't look like it. I make my about 5/8" square, ~2" long, drilled with 3/16" hole about 3"4 way down. Works real good. Better than anything you can buy in the store..
Tons of microbubles...
I got a huge chunk from local woodworkers shop for like 80 cents. Make about 20 of them at a time..
Just remeber, do not test in fresh water. I made this mistake and took me about two weeks to figure out that, was what my problem was.
-Tag
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