Some customers say that there is no bass, please check whether the front cavity is tightly sealed to the speaker. If the sound leaks, there is no bass at all.
A high-end metal diaphragm in-ear unit, with good bass space, good vocal, and good analysis. Generally, the cost of this kind of diaphragm is about tens of yuan, the production cost is quite high, and the quantity is limited and sold out.
![](https://img.alicdn.com/imgextra/i4/15448626/O1CN01ShDSp52Dal0cVaY6n_!!15448626.jpg)
![](https://img.alicdn.com/imgextra/i4/15448626/O1CN01FtiXHf2Dal0aj2eK5_!!15448626.jpg)