Fostex FE164 Mass Loaded Tapered Quarter Wave Tube (ML TQWT) by Martin J. King Design and Construction of a Mass Loaded Tapered Quarter Wavelength Tube (ML TQWT) Using the Fostex FE-164 Full Range Driver -- The full technical paper & MathCad model are available for download at www.quarter-wave.com An HTML summary of this paper, with pictures & diagrams will follow eventually. This tube is Modeled using the author's MathCad Transmission Line Model which is available as a downloadable Mathcad file Drawing of the As-Built Tube (Fig 1) Frequency Response -- Actual, Modeled, and a simulation of a same size vented box Preliminary information generated some interesting discussions on a couple of forums. The ML TQWT has been updtaed with Baffle Step Compensation. Fostex FE164 Fig 1: As built drawing

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Martin J. King is a lead engineer at Intermagnetics General Corporation a manufacturer of the superconducting magnets used in Magnetic Resonance Imaging machines. His primary job responsibilities involve performing computer analyses and simulations (closed form solutions, numerical solutions, and finite element analyses) aimed at solving product design and manufacturing problems.