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D.I.Y. Bass Traps- calling acoustic techs....

I have been reading about diy bass traps but still have some questions. For me I am going to build some round tubes with fiberglass pipe wrap or Rock Wool. This is avail locally in 3 ft sections and 12 in diameter with a 2 in thick wall. The paper cover can be removed and wrapped with cloth. The ends can be glued on with mdf or plywood.
The problem I have is a 50 hz bummp. Most of what I am reading says these traps are good around 100 hz. Do you think stuffing each tube with more fiberglas insulation will make them more effective?
If so, should it be packed loose or tight?
128x128blueskiespbd

Showing 2 responses by fpeel

fpeel
455 posts
 
The biggest problem in my room is a +5.5Hz bump at ~100Hz. To reduce it I'm going to try adding a set of the pipe wrap bass traps.

Jon Gale, who is usually credited with this DIY plan, wrote on one forum that there is a "supertrap" version. The biggest change is the addition of a second smaller fiberglass tube inside of the first one. While a little more complex to build they are supposed to be more efficient (more absorption in a smaller volume).

Can anyone offer details about the size of the second tube? Is there a specific ratio between diameters involved for optimum efficiency or tuning?
fpeel
455 posts
 
To follow up, I emailed Jon Gale and he responded. He had discussed the "supertrap" idea with ASC and the final verdict was the level of complexity of the build is not worth the difference in results.

My original thought was that a more efficient trap in the same package might be useful to Blueskiespbd. Hopefully it didn't appear I was hijacking the thread.
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