You could include the LXMINI CROSSOVER / ANALOG CROSSOVER NETWORK in your search. It is also an NP design and, from what I understand it’s pretty much the same thing. You can read about it here or on the First Watt website.
Kits are for sale in the diyaudio store but they might be out of stock now. I think I also saw an assembled one for sale here recently.
Bon chance.
Kits are for sale in the diyaudio store but they might be out of stock now. I think I also saw an assembled one for sale here recently.
Bon chance.