Foam tips affect high frequencies for sure, some cases for good, others not that much.
I noticed in the bass section a bit muffled sound with my xba3 too but I can't really explain the change.
Yes, these tips are a science on itself I guess :) these things can make an enormous difference ....
What kind of tips have you tried for your XBA's , and, where did you get them?
Shure Olives and their Cheap knock offs.
Can I have a comply pair? where do you live?
Sure you can have a pair. I live in Indonesia.
my comply's were a horrible fit with my XBA-30's, Turned the treble into this weird metallic sound. Just horrid.
Maybe its caused by the portion of foam that's beyond the rubber tubing. I remember an old thread that discussed this. He got better results by cutting off the overhangs.
Try at your own risk