Desiging a high quality crossover for a horn system is not trivial. In my opinion, one must start with a comprehensive suite of measurements, and then there are many cycles of follow-up measuring, calculating/modelling, modifying the circuit, and measuring again as the crossover is refined.
The most important part of the crossover is the thoroughness of the design work. Your experience seems to bear that out - the JBL Pro crossover built with presumably decent but not high-end parts outperformed the crossovers built with high end parts, as well as the high end DSP crossover.
In my opinion, the best crossover will probably be the one that a competent designer with good test equipment in a good facility, using good software, spent enough time on to thoroughly optimize.
Duke
dealer/manufcturer
The most important part of the crossover is the thoroughness of the design work. Your experience seems to bear that out - the JBL Pro crossover built with presumably decent but not high-end parts outperformed the crossovers built with high end parts, as well as the high end DSP crossover.
In my opinion, the best crossover will probably be the one that a competent designer with good test equipment in a good facility, using good software, spent enough time on to thoroughly optimize.
Duke
dealer/manufcturer