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Thank you Chris for this most valuable information. I guess DSP is the way to go. Still I´m and old dog, and as you know. It takes time for an old dog to learn how to sit. Going into the digital domain will take me time to adapt to. In the mean while I´ll try to get the 4592Nd to sing with passive filters. @Deang I am very interested in what you posted above. Could you explicate it further. I recall the two top images as the mid- respective hi-driver frequency response. But what is the difference between the grey respective red curve? I guess the bottom right image is a topology that what Bill Woods designed for BMS 4590. Is this driver similar to the BMS 4592Nd implying that the same topology could be worth trying for me? Is the bottom left image the frequency response of the BMS 4590 with the Bill Woods filter in use?

Thanks Chris, your text is very much appreciated So far I have avoided dsp's of emotional reasons (I use only analogue sources and SE triode amps), because not beeing able to "see" and understand the complete signal chain makes me a bit nervous. I´m currently going 3-way having low-level 1st order LP-filter at 350Hz (bi amping), so going going dsp filter will require tri-amping and a 3 way DSP-unit. Hence a rather big change. Any suggestion which dsp-unit to try? Just to understand you clearly. With balanced gain and correct delay (and moderate sound levels) I could actually remove the 6K3 hz filter between Mid and Hi, without worry destroying the fragile HF diaphragm in the 4592Nd?

Im using BMS 4592Nd (16 Ohms) coax drivers in a pair of 200Hz Tractrix horns. I´m currently using the 6300Hz original passive x-over for mid/high, but feels there must be potential for improvements here. I would really appreciate if someone with similar setup could share the schematic for such a filter