For W4, which star tips do y'all prefer; the long medium (red) or the medium ( black) ones? I had a problem that after wearing the bulky ATH-IM70 for a while, apparently my ear canals were enlarged which makes the black star tips inserted easily than before...Now I had to switch with the long medium tips on my W4. I notice bigger soundstage and better bass response and less forward midrange; but at some time although the treble is smoother, it could be shrilling.
It is 100% a personal thing. If treble is sounding shrill you have the wrong tip (too loose a fit). The supplied ones with no color designation work best for me. I think they are standard mediums.