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@mijostyn, A D'Appoltio Array uses a 3rd order cross-over not a 6dB 1st order cross-over.
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I happen to have discussed this subject with Dr. d'Appolito. I was considering building a set of DIY speakers based on a Dynaudio design for DIY,. the Myrage. The system used first order crossovers. I called up Dr. d'Appolito at his home and asked him about 6db crossovers for his array. He told me that a d'Appolito array functioned as designed with any odd order roll off slopes, but that he was personally partial to 18dB slopes.
I happen to have discussed this subject with Dr. d'Appolito. I was considering building a set of DIY speakers based on a Dynaudio design for DIY,. the Myrage. The system used first order crossovers. I called up Dr. d'Appolito at his home and asked him about 6db crossovers for his array. He told me that a d'Appolito array functioned as designed with any odd order roll off slopes, but that he was personally partial to 18dB slopes.