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Well, that's not quite what I meant, so I probably should have been clearer. This can't be accomplished with a small plate near the end of the pipe. It wouldn't have enough surface area. Without a lot of surface area, the holes have to be too large, otherwise flow suffers. If the plate has a really large surface area, the holes could be made much smaller, attenuating the upper frequencies without restricting flow. I was thinking about a plate that would be nearly the length of the entire pipe. Imagine a long, skinny oval, drilled with a few thousand holes. It would be welded into the pipe at a diagonal, so all gas entering the pipe has to go through the plate. I think that might sound a little better.



Interesting concept! I don't think it would be easy to predict the type of sound that would come out, but I would like to know.
You have to take into consideration that high and low frequencies reflect at different rates and cancel themselves in different areas of the chamber. It could be good or not so good. Volume, hole size, and pulse frequency all play into this.

Clay

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