Martin J King Mathcad Worksheets ((exclusive))
Line by line, Martin J. King had built a cathedral of math. The worksheets were legendary in the obscure world of DIY speaker builders. King had solved a problem that baffled even seasoned engineers: how to perfectly model a "transmission line" speaker—a labyrinthine enclosure that used quarter-wave physics to produce bass that was deep, fast, and clean, without the muddy boom of a ported box.
However, the legacy persists. While you cannot always get the raw .xmcd or .mcd files directly from his main landing page, the community has preserved them via the and dedicated DIY audio forums (DIYAudio.com, AudioKarma, The Loudspeaker Building & Design Facebook groups).
Further down, past the inputs, you will see the output graphs.
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.
Geometric taper impacts (expanding, contracting, or straight lines). Real-world internal stuffing and damping performance. Key Categories of the Mathcad Worksheets martin j king mathcad worksheets
Even slight changes in the taper or the driver’s position along the line significantly impact performance.
They solve the equivalent acoustic and electrical circuits for the driver and enclosure, considering factors like stuffing density, driver location, and tapered geometries. Core Capabilities:
Instead of treating the air inside a box as a simple spring, King’s worksheets treat the enclosure as a transmission line or a waveguide. By applying one-dimensional wave equations and advanced matrix boundary conditions, his models accurately predict: Acoustic impedance transformations. Distributed mass and compliance of air columns.
However, the legacy of his equations remains foundational. The engineering models he popularized have since been integrated into, or adapted by, other loudspeaker simulation software packages: Line by line, Martin J
Martin J. King (M.J. King) revolutionized the DIY audio community by introducing highly accurate, accessible mathematical modeling tools for loudspeaker design. For decades, hobbyists and professional acoustic engineers relied on simplified, over-the-counter formulas that failed to capture real-world cabinet complexities. King changed this paradigm by publishing a suite of custom Mathcad worksheets. These sheets mathematically model complex acoustic behaviors, specifically focusing on quarter-wave designs, transmission lines, and open baffle systems. The Core Philosophy Behind M.J. King’s Models
While commercial software handled standard ported boxes well, King’s sheets evaluated ported enclosures using quarter-wave theory. This revealed internal pipe resonances that traditional calculators missed, allowing designers to minimize chuffing and unwanted midrange leakage through the port. 3. Open Baffle and Dipole Worksheets
The algorithms are versatile enough to simulate a wide variety of enclosure styles, ranging from basic TLs to advanced Mass Loaded Transmission Lines (MLTL).
The math said it would work.
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.
For decades, audio engineers and DIY speaker builders faced a daunting challenge when designing transmission line (TL) loudspeakers. Traditional acoustic theory offered plenty of complex mathematics, but translating those equations into a physical enclosure required extensive trial and error. This gap was bridged by Martin J. King, an engineer whose Quarter-Wave acoustic models transformed speaker design from an unpredictable art form into a precise science.
Designers define the physical dimensions of the line. Key parameters include the total length ( ), the cross-sectional area at the start ( S0cap S sub 0 ), and the cross-sectional area at the termination ( SLcap S sub cap L Modeling Damping Material
