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You are right, the shape of SF tips is sharp, They can be inserted deeper, so the room of the ear channel is smaller, sound pressure of the subbass is a little higher, but channel of SF tips are longer, so frequencies around 6k to 10K Hz are higher, so it sounds brighter, but the frequency response of SF tips over 10khz( I call them as treble extension) is much lower than the stock tips.
I found my previous eartip measurements. I'm not seeing or hearing any benefits in the >10 kHz region with the stock tips:
https://www.head-fi.org/threads/flc...ressions-thread.777158/page-443#post-13726751