Cannot comment on the Hiraga crossovers as I have no experience, but in general... crossovers with driver polarity reversals are no good. Put high and low frequency drivers in opposite phase and imaging dies a cruel death. I have long built crossovers with simple first order filters and luckily have never lost a diaphragm.
I used to run into this with the Lansing Iconics. Connect the drivers as indicated by these second order networks and the imaging was vague, although the power through the crossover frequency was fine. Put the drivers in the same polarity and the imaging was great although there was a hole at the crossover frequency. I always preferred the in polarity connection overall.
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