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In Reply to: RE: Tube Bass Traps. posted by rosendds@frontiernet.net on October 20, 2016 at 06:28:33
I used the Knauf pipe insulation. It is 12" ID and 1" thick, 36" long. Capped them with 13" diameter plywood. Did not stuff them, instructions said empty air space was better. I covered mine with cotton batting (to contain fiberglas fibers) and gray muslin. Muslin is like thin soft denim.
The instructions I used claimed the Knauf pipe insulation had similar density to the ASC Tube Traps. Using the Knauf pipe insulation makes it easy, but costs a little more (US$7.47 per foot back in 2007).
The room smoothed out better then I had hoped for. My son and I took SPL readings without traps and with traps. Ten freqs (25-200hz), 7 places in room, with traps and without traps(140 readings). The SPL readings confirmed our ears. I couldn't be more pleased with this DIY tweak.
Follow Ups:
Thanks for the information.Did you use construction adhesive to join the 36" segments, and cap the larger tubes,or did you put plywood caps on each segment and stack them?
Liquid Nails construction adhesive for seams and caps.
Each 36" segment capped on both ends.
Where did you source wooden pie plates?I will call my dealer and ask more questions about the Manville compressed fiberglass pipe insulation vs the Knauf product.
Wooden pie plates was E-Stat's suggestion. I used plywood.The Knauf pipe insulation has the same or similar density as the commercially sold ASC Tube Traps. Hmmm, where does ASC source it's tubes?
If I understand correctly:
Tube bass traps are a simple resistive/capacitance circuit.
The diameter of the tube correlates to the frequency most efficiently captured.
The walls of the tube provide the resistance.
The interior space of the tube is the capacitor.
Sound is propagating waves of high and low pressure.
As these waves of high and low pressure air pass through the tube bass trap, they create a pressure differential between the inside and outside of the tube.
This pressure differntial tries to equalize by leaking through the sides of the tube. Correct density insulation will let the bass pass through but create a resistance to this equalizing flow.
As the air is forced repeatedly in and out of the tube interior some of the energy is absorbed by the tube walls. This energy being absorbed is sound, in this case bass.
Edits: 10/22/16 10/22/16
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