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RE: Maybe need to clarify

The cap values should simply be adjustable in proportion to the input impedance of the tweeter power amp - Cnew= Cold * 39k / Ri

I would drop the resistor L pad in favor of a good quality 10K cermet or wirewound pot used as a variable resistor so you can tune the XO to the subjective balance that suits your system room and taste.

The low pass section should stand on its own unless the output impedance of your preamp is unusually high.

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