Modifying Crossovers

+1 @erik_squires   I've "crossover component upgraded" a dozen pairs of decent mid-fi speakers with terrific success, however, these all had 20 cent caps in the crossover.  I never varied from stated values.  

Always upgraded the wire also.  For $50 total it was amazing how much more performance could be squeezed out of the current design with better parts.

The Borresens need be carefully assessed at that level before 'Frankensteining'.  A slip of the scalpel and you've a doorstop.

@jaytor I was headed that way (internal) but I went with Jantzen foil inductors and I finally gave up trying to make everything fit.  I even had one built and disassembled it last night.  Good luck with your upgrade. 

Jerry

@carlsbad2 - I've been using these crossovers in my dipole planar-magnetic line arrays since November. They took a few months to fully break in, but are now sounding fabulous. 

It's not wrong to want to eek out more performance from current or new speakers. Adding components of higher quality may make no noticeable difference or maybe it will be fabulous. If you are so inclined you might actually decide that your improvements may breathe new life into your already trusted system to the point that you don't feel the need to make a major purchase. If I'm thinking of some new speakers why would I not at least consider upgrading what I already have. To me it makes fiscal sence. I will also learn another how to. For me this should at least be considered. 

While the question is " Modifying Crossovers "  the reality is that we are  "upgrading" our crossovers .  I have even stayed with the same manufacturer for the film capacitors , as to not stray far from the original " house sound " of the speakers . For me the resistors were the surprise performance improvement .