Wayne Parham Messages: 18783 Registered: January 2001
Illuminati (33rd Degree)
I've never built a speaker to use a non-tapered transmission line for a tuning device. But I can't see any reason that having cross-section area equal to diaphragm area should be a requirement. Check out the paper written by Daniel Russell called "Acoustic High-Pass, Low-Pass, and Band-Stop Filters," which contains some information about acoustic waveguides and transmission lines.
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