Semi-open headphones: no clear definition, a work in the high frequency band is open, work in the low frequency band is closed, you can have a natural sense of hearing and good low-frequency response; another headset on the outside world sound Is open, can enter, and the sound leak is very small; some people also open the shell around the ear headphones called semi-open headphones.
Closed headphones: the shell is closed, the ear cushions close to cover the ears or suppress the ears, to prevent the outside sound into the earphones of the ear type of the type of around the ear, the sound leak little or no leakage, In the professional use of a lot of monitoring. Sound is generally very clear, rich in detail, low frequency response is very good, but there may be too much heavy, or oppressive, for most people, closed headphones are not open headphones comfortable. Headset suppliers in these products into the funds will be relatively large, because the cost is relatively high, the market price is also more expensive. For the special industry is also very practical.