Martin J. King is a retired engineer who applied his professional background in mechanical and acoustic engineering to the field of loudspeaker design. Unlike many commercial software developers who create "black box" programs—where the user inputs data and receives a result without seeing the internal logic—King took a different approach.
He utilized PTC Mathcad, a computational software tool that uses a unique "whiteboard" interface. In Mathcad, mathematical formulas are displayed on the screen exactly as they would be written on a chalkboard, alongside graphs and text. This transparency allowed King to share not just a tool, but an education. martin j king mathcad worksheets
In the world of audio engineering and loudspeaker design, few names command as much quiet respect among DIY builders as Dr. Martin J. King. While commercial simulation software like LEAP or COMSOL exists, King took a different, more transparent route: he built a comprehensive suite of loudspeaker modeling tools using Mathcad, the engineering calculation software known for its live mathematical notation. Martin J
For over two decades, Martin J. King’s Mathcad worksheets have been a gold standard for understanding and designing transmission line (TL) loudspeakers—a notoriously complex enclosure type that standard ported-box models cannot accurately handle. He utilized PTC Mathcad, a computational software tool
In a standard TL, the driver is at the closed end. King provided specific worksheets to model placing the driver 1/3 or 1/2 down the line, which helps smooth out standing wave ripples.