I've uploaded a second draft of my crossover demonstration document. This publication includes second order networks as well as the first order crossovers already discussed. Since compensation networks were already introduced, they are incorporated in the second order design but not discussed for a second time. Compensation networks perform the same on a second order crossover as they do on a first order network so no further discussion of them was necessary.The models shown on this document and the Spice executables are still available in the Spice models distribution on the Pi Speakers website. Also included are models for the third order networks used in Pi Speakers.