These sheets model enclosures where the acoustic path length equals one-quarter of the target resonant frequency. They allow users to optimize the driver position along the length of the line, which is a critical technique for canceling unwanted higher-order harmonic resonances. 2. Mass-Loaded Transmission Lines (ML-TL)
A transmission line loudspeaker uses a long internal duct or tunnel behind the bass driver to guide back-wave acoustic energy. If designed correctly, the acoustic output exiting the terminus (port) reinforces the speaker's low-frequency performance, extending bass response well below what a standard sealed box could achieve.
Whether you prefer a or a no-compromise open baffle . martin j king mathcad worksheets
Martin J. King’s worksheets were originally distributed via a modest subscription or donation model on his website. Over the years, as Mathcad evolved and shifted toward subscription-based corporate pricing (PTC Mathcad Prime), running the original legacy worksheets became a challenge for casual hobbyists. To use the original worksheets today, you generally need:
The Martin J. King worksheets are a collection of Mathcad files (.mcd and later .xmcd) that model the acoustic behavior of loudspeaker enclosures. Originally hosted on his website (quarter-wave.com), the worksheets cover a vast array of topologies, including: These sheets model enclosures where the acoustic path
Are you planning a specific build and need advice on geometry?
Originally released around 2000, these worksheets evolved from basic transmission line (TL) models into highly flexible tools capable of simulating a wide range of enclosure styles. Unlike simpler "magic box" software, these worksheets are intended for "what-if" analysis, helping designers understand the acoustic consequences of physical changes. Martin J
King's suite of Mathcad worksheets is remarkably comprehensive, covering the entire family of quarter-wavelength speaker designs. The main categories include:
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