I've never modified a speaker crossover, however I've upgraded the crossovers of 15 pairs of speakers over the years. I've used Panasonic metallized film or Solen capacitors of equal value for the caps pulled. Once I used Auricaps, but they tend to be expensive and should be used with higher end speakers.
I upgrade the internal wiring, usually with decent Audioquest or Kimber and pack the corners with rope caulking. Hope that answers your inquiry.
I upgrade the internal wiring, usually with decent Audioquest or Kimber and pack the corners with rope caulking. Hope that answers your inquiry.