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RE: Tube Bass Traps.

I built 67 of these for my sound room. Forget the brand, but it was simiar to Knauf. Believe the place was Pacific Insulation here in Portland. ASC is 2 hours away, in Eugene. The ware-houseman said they had "a guy" from Eugene that bought the same stuff. I didn't fill them with anything, but I did put a circle of fiberboard 1/3rd of the way inside the tube, with a 1/4" airhole in the middle. I cantered it slightly to break up resonances. The hole is for pressure equalization. Used drummel-cut 1/2 inch pressboard for the ends, liquid nails as adhesive. My recommendations:
* experiment with the thickness of plastic for diffusion on 1/2
* A 4 ft height is much more useful=1 unit would be over ear height
* They hold up for years, but the chicken wire ASC uses adds stability
* Find a shop that will cut the circles for you ! (Pain to do by hand)
They make a huge difference in bass and imaging. Map out your room nodes and consider the lowest frequency that your speakers put out and ear can hear. I initially built 2 helmoltz resonators to address my 22hz fundamental. My Maggie6L's don't go much below 60hz and my ears lose 40 and below. Oops.
"I see sound waves"

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