Then there is the selection and matching of drive units and a host of other stuff on cabinet design. I love the thought of building my own speakers but the thing about it is I do not have the experience or the knowledge to design the best crossovers and I do not have the required measuring equipment to test them (hydraulic hoist to get them 30 feet up in the air as KEF used to do and probably still do OR an anechoic chamber). probably with a little help and training - would I do it? No. I do not service my own gas boiler and I do not repair my television and I do not service my car. Then, however, irrationally, I'd read off the values and get someone to make me an analogue crossover which did exactly that job. I was thinking last night in fact that if I were addressing this challenge then I might actually do all my design iterations/crossover tweakery with a digital crossover, refining and adjusting until I'd got it to where I wanted it. But let's not divert the conversation into a theological argument about the merits and demerits of such a format. I would do likewise frankly if I were building my own speakers, as a good many fellow parishioners would too, keeping the digital process-y bits to where they are essential. Unless you are one of those plastic disk spinners, in which case keeping it all in the analogue domain makes sense, avoiding DSP seems a tad irrational IMO. If you buy the right streamer, you can apply dsp at source and still use an analogue crossover.
I also question your desire to avoid DSP.
Unless someone is building the kit for you and testing the correct cap values (which isn't a DIY project.) I think the conclusion re thread owner is that you really shouldn't undertake a DIY speaker project with passive crossovers.
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