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Whitestix, a good buddy of mine has the S300 and it’s pretty stunning what those relatively small speakers can do. Haven’t heard the S400’s except at Axpona a couple of years ago but I couldn’t get a real feel for them there. That being said I have had Danny Richie with GR Research upgrade the crossovers for two pairs of speakers I own. He does fantastic work and is responsible for the crossover designs in many speakers. You may shoot him an email and see if he has any offerings for the 400. I have a pair of peachtree d5’s that he upgraded which cost around $500 for new crossovers and level matching the tweeters. Same with a pair of Era D10’s. Good luck.
I’ve upgraded so many crossovers and interal wiring over the years, I’ve lost track.
I can’t remember a single time that the process did not yield appreciable improvement.
I can really appreciate companies like Buchardt, where they are up front about having different levels of crossover components. Lots of companies pass their supposedly high end speakers off, with crapy crossover parts.