I would like to know your opinions when using toroid inductors for speaker crossover. The board and toroid inductors are made by me here in Canada.
This is the direction I am heading for my own XO. Air Toroid. A toroidal geometry eliminates cross-talk. In other terms. Std wound cores have their magnetic center shooting out from the center which forces one to heavily consider their mounting position, similar to tube amp's OT. With a toroid that is not a problem, so it just makes sense. If there is room, use it for the woofer as well. While it is bulky and larger, I think there is a great benefit in using air cores all the way. Perhaps not necessary but its the small details that count.
Not to be snarky, but an air core toroid is probably a nonsequitur, or at least wildly inefficient. The magnetically permeable core is the only thing that allows you to bend the coil into a circle (and also concentrates the magnetic field in that loop so as to not interact much with nearby objects)
Is that about the same inductance for both crossover sections, though? Usually it doesn't work out that way, with the difference in input and output impedance.