Hi Mp: certainly you've thought about, or have even actually tried, to upgrade that offending crossover cap. with a different component of equal value capacitance but of better quality? There are a number of brands available (Solen, Hoveland, MIT multicap, Musicap, etc.) so it seems that some experimentation in that regard might be the first & easiest approach to cleaning up your midrange.
Best three way cross over?
I have noticed that the passive crossover (Capacitor) between my woofer and midrange speaker is responsible for a lot of muddying of my midrange. When I bypass it, the sound is much clearer and transparent, however then I have too much bass from my mid driver. I am curious as to what people have found is the purest sounding crossover network they have used for a three way speaker...particularly for the mid driver. I have not used an active or a digital crossover, would either of them work better (be more transparent)for me?