Closed earphones wrap your ears through its own soft sound pad, so that it is completely covered. This type of headset has a large sound pad, so it is larger, but with a sound pad, it can be used in noisy environments without being affected. The earmuffs put a lot of pressure on the ears to prevent sound coming in and out, and the sound is correctly positioned and clear. This is more common in the professional monitoring field. However, this type of earphone has a disadvantage that the bass sound is severely stained. The W100 is an obvious example.
Open earphones are currently a more popular style of earphones. The feature of this type of model is the use of sponge-like microcellular foamed plastic to make sound-transmitting ear pads. It is small in size and very comfortable to wear. It no longer uses thick sound-dyed pads, so there is no sense of isolation from the outside world, and the sound can be leaked, and vice versa, the outside sound can also be heard. If the earphone is opened to a high degree, you can hear the sound from the other side unit, forming a certain mutual feed, making the listening feel natural. But its low frequency loss is large, and some people say that its low frequency is accurate. Open earphones generally have a natural sense of hearing and are comfortable to wear. They are commonly used in HIFI earphones that are appreciated at home.