I agree with @yuviarora —-crossover inductors make a massive difference in sound quality. People like to swap caps but rarely do you hear comments about coil comparisons. In my high efficiency speakers with 12db crossovers, I have tried quite a few coils and I ended up with different types for the woofer and midrange/tweeter. On the woofer I prefer Solen 14g Perfect Lay air cores which have a warm, rich, dynamic sound. On the midrange/tweeter I prefer JantZen 15g Air-Core (solid wire); in this spot the Solen Perfect-Lay sounds too soft. I have also tried JantZen 14g C-Coil toroids which can sound pretty good on woofers but too edgy with mids and tweets. JantZen iron core with discs are nice and cheap but too edgy and fuzzy. I tried a number of foil inductors and didn’t like any of them. Vintage iron coils are too edgy.
I haven’t tried the new JantZen wax coils. From the description in this thread that’s now on my list of things to try.