Here is the crossover I'm developing for my 2 way speakers. The speaker is a sealed 2-way unit with the TC14SG and TC26SF drivers from Vifa. It is a 4th order acoustic Linkwitz Riley at 3kHz.
Here is the crossover schematic for the tweeter:
And here is the schematic for the woofer:
This crossover was developed with the aid of Speaker Workshop using the frequency response data from the manufacturer. I have since measured the actual drivers, and the crossover works very well for those as well. The data has been adjusted for the full amount of baffle diffraction, thus is probably down 3dB or so more (sub 500Hz) than it will be in-room. This design is my own, although I must credit Rick Craig from Selah Audio for the idea for the L-pad on the tweeter. My previous design did not use a full L-pad, and instead used just a difference parallel resistor and alternative values for C1 and C2. This was fine, but the impedance was not as good as it is now.
Here is the combined frequency response. The pink line is the response with the tweeter's polarity reversed, and shows a nice deep 30+dB null at the crossover frequency.
And here is the phase tracking through the crossover region - not bad considering what I had to work with.
I'll have pictures of the completed crossovers sometime over the next couple of weeks, including final measurements and photos etc.
Any comments regarding this can be sent to me via the link on the left.