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RE: MGIII active crossover?

Neo has you covered and his suggestions should get you there.

I would just add that a 3rd order symmetrical bass-mid XO is probably doable in the XM9 and would likely work better than an LR4. Where magnepan uses a 1st order HP filter it is actually joining with the 2nd order rolloff of the driver to form a net 3rd order crossover. So doing a 3rd order symmetrical should work more like the original alignment than LR4.. Ask Phil for 3rd order boards - 400hz seems as good an approximation as any.
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