. 60. Pi*radius^2. There is an infinite number of ways one can define a profile Z ( z) along the transmission line. Side-by-Side Single Fold Stereo Pair. . For 25 ohms, we calculate 31 mils line width and 7. A woofer with a large motor will displace a bit more. . Oct 21, 2022 · This is far superior bandwidth compared to what you would see with a practical quarter-wavelength transmission line for impedance matching. Update: The quality of cheaper speakers has improved over the past couple of years, but there has also been a shift away from larger drivers in order to save on cost - the cost of a large woofer, the cost of the extra wood to build a box to hold the larger driver, and the cost of shipping a heavier speaker - up to 250 pounds per >speaker</b>. The Terminus will usually have an area of 1, and is determined by the T/S parameters of the driver and the specific tuning of the line, length, and other geometric and acoustic factors.