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RE: Key... Active measurement Assistance...

"Even my "Simple MMG biamp project would have been a nightmare without measurement - a passive crossover often is also an equalization timing and phase adjustment. When you reconfigure a passive loudspeaker to active, you need to measure before and after - just like the manufacturer does when he develops the loudspeaker."

Actually, you don't. In fact, it's better if you don't.
Passive to active conversion (assuming your intention is to leave the existing transfer functions intact) is a very simple approach, and requires no acoustic testing of any sort. Neo has provided much of the required conversions in his spreadsheet and I provided a 3.6 working example many years ago on this very forum. (In fact, it's in use successfully by a number of PA lurkers.)
http://www.integracoustics.com/MUG/MUG/tweaks/davey/mg3.6xo.htm

If your intention is to re-engineer and/or improve the existing design(s), you better know what the hell you are doing regards acoustic measurements. :)

Cheers,

Dave.

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