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Apogee Centaurs- going active

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I have just built two 2 channel symasym amps and shoe-horned them into the stands of my Apogee Centaurs, removed the factory crossovers and have connected a 2-way minidsp and presently trying to optimize the crossover in anticipation of (maybe) an improvement over the passive devices.
Most of you, am sure are much more proficient at evaluating crossovers than I, and I would like suggestions on how I should implement the standard crossover functions into my minidsp. The stock crossover is found here:

http://www.apogeespeakers.com/projec..._crossover.jpg

The woofer appears to be crossed with BW second order at about 450hz, but I'm having trouble decifering the tweeter section. Nominal tweeter ribbon resistance measures 6 ohms, I think.
I am running the ribbon with single order BW at 800hz and then a fairly steep low shelf at 225hz. Doesn't sound too shabby but can it be improved?
Any suggestions how to interpret the stock crossover will be appreciated.
Peter

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