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RE: Tube Bass Traps.

Posted by DragonEars on October 22, 2016 at 16:19:02:
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.