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Construction and Measurement of a Simple Test Transmission Line
After deciding to use a Focal 8V 4412 mid-bass driver for my first transmission line design, I started looking for a simple enclosure in which to perform some testing to correlate my mathematical model. I came across a 48” long cardboard tube with a 7¼” inner diameter and ¼” wall thickness at my local hardware store. For five dollars I had a test transmission line enclosure. At one end of the tube I attached a nine inch square piece of ¾” thick plywood with a circular cutout that fit snuggly over the tube’s outer diameter. To secure this plywood flange, nails were driven outward through the tube into the plywood at eight locations. The seam was sealed on both sides with silicon caulk. The Focal 8V 4412 driver was mounted to the flange with a length of speaker cable threaded out through the open end of the tube. Figure 2.1 shows the test transmission line set-up.
After deciding to use a Focal 8V 4412 mid-bass driver for my first transmission line design, I started looking for a simple enclosure in which to perform some testing to correlate my mathematical model. I came across a 48” long cardboard tube with a 7¼” inner diameter and ¼” wall thickness at my local hardware store. For five dollars I had a test transmission line enclosure. At one end of the tube I attached a nine inch square piece of ¾” thick plywood with a circular cutout that fit snuggly over the tube’s outer diameter. To secure this plywood flange, nails were driven outward through the tube into the plywood at eight locations. The seam was sealed on both sides with silicon caulk. The Focal 8V 4412 driver was mounted to the flange with a length of speaker cable threaded out through the open end of the tube. Figure 2.1 shows the test transmission line set-up.
