Frequency divider is a circuit device, which is used to separate the input music signal into different parts, such as treble, midrange and bass, and then send them to the corresponding high, middle and bass driving units for playback.
It can be divided into two types:
(1) Power frequency divider: located behind the power amplifier and set in the sound box. Through the LC filter network, the power audio signal output by the power amplifier is divided into bass, midrange and treble, which are sent to their respective speakers. This connection is simple and easy to use, but it will consume power and produce audio trough and cross distortion. Its parameters are directly related to the impedance of the speaker, and the impedance of the speaker is a function of frequency, which deviates greatly from the nominal value, so the error is also large, which is not conducive to adjustment.
(2) Electronic frequency divider: a device for dividing the weak audio signal, located in front of the power amplifier. After frequency division, each audio frequency band signal is amplified by its own independent power amplifier and then sent to the corresponding speaker unit. Because the current is small, it can be realized by low-power electronic active filter, which is easy to adjust and reduces power loss and interference between speaker units. Therefore, the signal loss is small and the sound quality is good. However, this method requires an independent power amplifier for each channel, which has high cost and complex circuit structure, and is used in professional sound reinforcement systems.
Generally, multi-unit headphones use power amplifiers, which are similar to small parts of circuit boards. ?
I have made it clear to you that multi-unit headphones use a special audio frequency divider to realize frequency division. If you don't understand the principle of frequency divider, there is no way out.
I told you everything. A principle of earphone frequency division and speaker frequency division.
The custom earphone frequency divider and the driving unit are made together,
Shure? E5C is an exception? On the junction box, as shown in the figure: