Transmission line, the case was an audiophile looking for superior performance. The basic theory is the gate to the maze which is 25, 50 or 75% of a wavelength equal to the free air resonance of the driver. One of these lengths are low-pass filter around 75Hz. 25% of the wavelength will give you a 90 degree phase shift with more precise answer to three. The 50% phase shift of 180 degrees will give you an edge with less than the wave of reinforcements. 75% will give you the least before the wave of empowerment, and the longest was three lengths. 25% is the most commonly used to the fact that it is the shortest length of three. The port is responsible for 25-50% of the entire radiating surface of the driver.
The appearance of listening to the transmission line substantially fundamental resonance effects of the Caraudio subwoofer. The moderating effect of the transmission line is greater than a low or wide shelves, but less than a sealed box. Therefore the compound retains a certain air suspension, while at the same time, fight for the movement. Efficiency is better than the bass-reflex enclosure. Suspension of superior accuracy or acoustic seal, and therefore the frequency response is better than all other systems
Most transmission lines are tapered to avoid standing waves. The cone is usually go to a smaller size at the end of the harbor. Filling can be used to further slow the speed of sound and to further reduce the return of waves or standing waves in the box or online. I could not find an equation that relates the charge to reduce the length of the line, so this is where experimentation comes to play
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