interesting, MisterLuc, i noticed some differences with the triple flanges, too (you've seen the thread). strangely enough, i seemed to get better low and high end, and better imaging in particular. a wild, stabbing guess would be that since the 3xflanges go farther into your ear, the distance between the hole and eardrum is shorter, so the sound isn't affected as much by the ear's contouring inbetween??
it is nice to know i'm not the only one who hears a decidedly noticeable difference...but boy, if the custom molds sound like the 3xflanges, with much better isolation, i'll be in heaven. gonna try to order a set after vacation, and see how those do!
kell