Hi, I'm Japanese CIEM-DIYer & I always consult with this DIY thread.   BTW, XBA-4 has unique divers made by SONY, so it is hard even for DIYer to help you. I think XBA doesn't have any crossover. It makes its sound by arrangement of BA drivers. So it's very hard to sustain its original...

Hi MoZo2,   SHURE says they don't use electric parts on SE846 for low-freq pass filters on this article(Japanease). I think it means they don't use inductors to cut treble sounds.

Hi MuZo2,   Thanks to making a thread and introducing my blog & twitter. I'll make English entry on my blog, so please wait a minute.   Anyway, thanks to guiding me to Head-Fi !!