Components L1, L2, C2, C3 and C4 are on the Eminence crossover PCB, which are sourced by, and which use the same component values as the corresponding π Speakers 500Hz, 800Hz and 1.6kHz crosssovers. The 600Hz and 250Hz/1.6kHz units are also sourced by Eminence, but are special order items, available only through π Speakers.But for your application - the π 1K6a010dB crossover used in your four π's - It can be made using the Eminence PXB2-1K6 PCB, adding a compensation cable assembly for the tweeter and Zobel damper for the woofer. There are some photos of these addition cable assmblies in the post called "Compensation networks - Photos." And the Spice model for the crossover can be found in the distribution of Spice available here, on the π Speakers website.