Really cool! Can’t wait to hear your impressions vs stock fw.
I'll be honest I don't plan on A/B'ing them at all since I already did that at CanJam, but going from stock to BH 4 wire just now the most immediate thing that sticks out is that it feels there's a sort of veil lifted off of the sound. Fei Wan already has one of the most detailed mid ranges I have heard and I feel BH just helps add to that. On top of that you can notice extra separation between the notes without making them feel like they're being stretched or coming off as thinner. Bass dynamics also are notably improved which was my favorite part of testing as I felt Fei Wan bass dynamics are already some of the best I have heard in general. In general it does a great job at improvement overall end to end extension. For a copper cable I hear it to stay rather neutral/not enforcing its own "sound" on the IEM, which was what I was looking for. Whereas something like Orpheus has a much stronger presence on whatever you plug it in to. I wanted Fei Wan to sound like Fei Wan but... better (?), I was also mostly just chasing a nicer cable in general as I find the stock cable to be meh.
Ergo when moving around are fantastic, the cable has a nice thickness and weight to it without coming off as obtrusive. It's also incredibly supple and a joy to handle and look at. All the NightJar cables I tested at CanJam including the beast that was Sovereign Symphony were very nice in terms of handling.