DIY Linkwitz-Reily 4th Order high pass?

I'm not sure if this is the correct forum or not?
Could someone point me to an online calculator dealy where I can just punch in the frequency I want and it'll tell me what value parts I need to buy to build my high pass filter?

I want a 4th Order Linkwitz-Riley high pass set to 50hz.
Like in the pic below?

I'm a crossover newbie, I'm sorry to say I have not studied this subject before.
I guess this isn't really considered a crossover though?
I googled but didn't see a calculator on the first page of listings.

This is for an Aurasound NS3 4ohm full-range driver in a .04 cu.ft. enclosure tuned to 70hz at ~33 watts.


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