Wayne Parham Messages: 18786 Registered: January 2001
Illuminati (33rd Degree)
I don't have plans or schematics for obsolete models anymore, but they did have very simple crossovers. There are a lot of archived threads you can search through here discussing piezo characteristics and the way they act with passive components inline. Things like using capacitors as attenuators and using resistors as filters.
The current models are pretty simple too, using purely first-order filters. The tweeter has a 10uF Solen capacitor in series and the woofer has a 0.5mH coil.