This project used a Fostex FE-164 full range driver in a TQWT style of enclosure. Because of the port loading, I have called this a Mass Loaded Tapered Quarter Wavelength Tube or a ML TQWT for short. This is by far the most popular enclosure I have designed with at least six more pairs built exactly as I describe in the article below.
Design and Construction of a Mass Loaded Tapered Quarter Wavelength Tube (ML TQWT) Using the Fostex FE-164 Full Range Driver. By Martin J. King, 4/21/01
Recent Design Improvements for the Focal Transmission Line Speakers and the Fostex ML TQWT Speakers. By Martin J. King, 7/29/01
