The “vibrations” produced by dynamic drivers. Part 4.
This time, we will explain how 634EARS is actually working to reduce the vibration of dynamic drivers.
If the dynamic driver is firmly and rigidly bonded to the enclosure, the vibration of the driver will escape into the enclosure. In other words, the enclosure vibrates together with the driver.
This is meaningless.
On the other hand, attaching a vibration-damping material to the driver is not very effective.
The most effective method is to apply force to the dynamic driver by propping it up.
For this purpose, 634EARS uses a vibration absorbing material such as urethane material that repels vibration when compressed.
This material repels and returns to its original shape when compressed with a finger.
When this material is compressed and attached between the dynamic driver and the earphone housing, this vibration absorbing material will rebound and return to its original size.
This repulsive force is used to hold the dynamic driver in place from 360 degrees around the dynamic driver.
However, if the vibration-absorbing material is compressed too much and the repulsive force is too strong, the dynamic driver will be too firmly fixed to the earphone housing and the vibration of the dynamic driver will escape into the housing, while if the repulsive force of the vibration-absorbing material is too weak, the dynamic driver will not be firmly fixed and the vibration will be absorbed. On the other hand, if the repelling force of the vibration absorbing material is too weak, the dynamic driver will not be firmly fixed and vibration will not be absorbed.
It is necessary to adjust the repulsive force of the vibration-absorbing material between the earphone housing and the dynamic driver to just the right degree.
Therefore, it is very difficult to design a housing by calculating these forces from the design stage.
However, it is very important to absorb the vibration of the dynamic driver and to fix it firmly in place in order to produce a good sound.