Unlike
any other bass trap, the physics behind the TubeTrap are
based on a capacitive-resistive circuit. The acoustic capacitor
(C) is the air chamber inside. The bigger it is, the more
efficient the TubeTrap is at low frequencies. The acoustic
resistance (R) is DC impedance matched to the radiation
(LC) impedance of a freely radiating soundwave. Because
of this design feature, the TubeTrap is more than 100% efficient.
Another unique feature is
the adjustable diffusion grid built into the TubeTrap. The
specular diffusion panel that covers half of the TubeTrap
is an acoustic choke (L) which is sized, ported and mass
loaded to backscatter the treble range.
Absorption
Coefficients
*Tested in corners
with reflector panel facing into the room
Design
Rolloff & Crossover Frequencies
Diameter
Rolloff Frequency
Crossover Frequency
9"
110Hz
400Hz
11"
90Hz
400Hz
13"
70Hz
400Hz
16"
55Hz
400Hz
20"
40Hz
400Hz
General
Description
Standard length of 4 ft. (47-1/2"
actual), custom lengths available
Adjustable diffusion above 400Hz
Broadband bass absorption
Locate in corners for best results
Here's an example of front-end control
in this room with all concrete wall and wood floor. There's
a suspended acoustic ceiling, upper traps are not needed,
just the lower half of the room needs to be controled.
