The Hideaway TL Sub

This article, a Danish blueprint for an “invisible” subwoofer was originally published in audioXpress July 2006 and it is the first of two by Bjorn Johannesen. In this first article, the author describes a successful transmission line to replace a vented sub, inspired by Rick Schultz articles. A project where the first approach revealed a resonance frequency lower than expected — lower than the driver’s Fs, leading him to study Martin J. King’s quarter wave design.