In terms of in-ears, no other headphone design is as dependent on proper insertion and wearing for comfort and sound.
For many first-time in-ear users, it may be a bit unusual to perceive almost no outside noise after insertion, but that's how in-ears work. This is also how you can tell that the right position has been reached. Due to the tight fit in the ear canal, you almost don't feel the weight of the in-ears anymore, which should also make them comfortable to wear.
If the ear tip fits properly, the Earbud does not constantly slip out again and shields ambient noise very well. The Earbud now has little play and sits tightly in the ear.
In this case, the headphones were worn crooked and do not seal properly. In addition, parts of the sound are reflected before they even reach the auditory nerve. The sound is limited when listening to music and making phone calls.
Ear-tip too large
If the silicone ear-tip is too large, the headphones only fit loosely and are likely to fall out when moved more. In addition, sound easily penetrates to the outside and the sound image is not optimal.
Ear-tip too small
In this case, there is too much air between the ear-tip and the ear canal. Sound is carried to the outside and the sound image loses a lot of bass. Communication is also more difficult when using the headset function. The wearing experience is also not very pleasant because the device wobbles in the ear and slips out easily.