Yes, it is necessary to change the crossover. The best way of upgrading the crossover is to replace the parts with the same values but higher quality. BUT this will not NECESSARILY make them sound better. I am facing the same question and it is not simple. Unless these are very good cabinets you may be getting into more trouble than you expect. All the elements in a speaker work together and just changing some part for a "better" one doesn't mean you will like the sound better. The landscape is littered with experimenters who got worse results. Now if these were bad speakers to begin with then this doesn't apply to the same degree. I am replacing the internal wiring and speaker posts on my Spendor S 100s and contemplating further steps but these two should give an improvement on about any speaker. Talk to someone like Madisound about your particular speakers. Also many DYI sites but unless you want to devote serious time and money to a project it is probably easier and cheaper to get a good pair of used speakers on this site.
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