I have been asked many times about making a three way version of the Kairos and the Continuum. I know several have done so with powered woofers, however, there’s a lot that can be said for a properly designed three-way when it comes to smoothness, low distortion, and proper tonal balance, as well as having the simplicity of a passive design driven by your own amplifier.
Not only have I developed an "official" woofer module (actually two) that can be used to convert the Kairos and Continuum into three-way loudspeakers, I have made it so that it can be used to the do the same for a large number of other similar stand mounted two-ways.
How this works is all explained in this paper that you can download in pdf format:
Since Meniscus will be the supplier of these parts and soon to be kits, I will try to maintain this forum and thread for discussion and questions regarding the design.