Did some tip rolling. Stock tips are pretty useless for me. Their double flanges are too small. And the large protruding double flanges doesn't seal well at all. The large white silicones fits the best. Like any other universal iem, the sound has tip bore size dependency. The largest bore size that comes with the tips are the most ideal. I tried a narrower bore, but it compresses the sound space a bit. Too bad their stock tips don't fit me that well, and the best fitting tips I have from another iem doesn't have the ideal bore size. I need something like Spiral Dots fit with the same bore size as the stock tips. I think that would put out the optimal sound out of these.