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 acoustic interaction between the driver and the terminus (port). Why Mathcad?
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 martin j king mathcad worksheets
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.
King developed original algorithms to simulate the effect of fiber stuffing (such as polyfill or long-hair wool). The worksheets allowed users to vary the density and location of the stuffing, showing exactly how it suppresses unwanted higher-frequency resonances while lowering the speed of sound inside the enclosure. Martin J
Before you even look at the math, you must have the correct software. This is the most common stumbling block.
Modern users often rely on PTC's built-in converters to port the old .mcd files into modern Mathcad Prime formats, though formatting errors can sometimes occur during translation. To use the original worksheets today, you generally
Critical for minimizing port noise. Why Use Mathcad for Speaker Design?
[Input Driver Parameters] │ ▼ [Define Duct Geometry & Length] │ ▼ [Simulate Raw Frequency Response] │ ▼ [Add Virtual Stuffing/Damping] ──► (Smooths out sharp resonant peaks) │ ▼ [Optimize Driver & Port Location] ──► (Cancels unwanted harmonic ripples) │ ▼ [Finalize Enclosure Blueprint]
A dedicated, free software program explicitly inspired by King's quarter-wave models.