His worksheets often included calculations for baffle diffraction , helping designers account for how the cabinet's front face affects frequency response. How the Worksheets Function

King is credited with popularizing the MLTL , which uses a port (or "mass loading") at the end of a transmission line to allow for a smaller enclosure while maintaining deep bass.

Martin J. King (often referred to as MJK in the DIY community) developed these worksheets to bridge the gap between complex acoustic theory and practical speaker building. Key contributions include:

His models moved beyond basic "lumped parameter" models (like Thiele/Small) to account for the physical dimensions and standing waves within a pipe or enclosure.