Agree, one of the best "cheap" iem out there, soundsig is way more comfortable than Joyroom e107 to my ears. Btw, is that stock Havi tips?

Yup, Havi tips. They're one of the few that stay on securely and provide excellent sound. Sticking these drivers in a tip-mounted design (like EPH-100) would be awesome. Really seems to improve the sound with tips that shorten the distance from the driver to your eardrum

You're right, havi tips fits perfectly and very comfortable too, vocal are improved, sweeter than before. I have those tips but never tried on my k2s haha, I use piston 3 tips before and it was good also. Thanks a lot B9.