A local dealer builds custom speakers (mostly horn-based, using vintage drivers). I’ve heard these systems being tuned in, which includes changing internal wiring and crossover components. The sound can be quite significantly changed by choice of different caps. This particular builder hates Mundorfs of all sorts in both speaker and electronics builds (he doesn’t like Duelunds either). Most of his builds are done with vintage caps (some very old and hard to find, like Western Electric paper in oil caps) and modern caps from Audio Note.
A previous discussion included a statement about crossover components.
The commentator stated something to the effect that some very high end speakers really cheaped out on the capacitors and resistors in their crossovers, and hinted that replacing them with high quality components might improve the sound quality of the speakers. My question is "Have you ever replaced the caps and resistors in your speakers crossovers, and to your ears did that result in better sound quality?" Also, what brands of caps and resistors do you consider to be "the best", and why?