What is the difference between active and passive audio

Release time:

2020-01-15

Summary： Today, Shijiazhuang Professional Audio will take you to understand what is audio active, what is audio passive, and what is the difference between audio active and passive?

Today, Shijiazhuang Professional Audio will take you to understand what is audio active, what is audio passive, and what is the difference between audio active and passive?

The active sound division is also called active frequency division, which is the frequency division of the audio signal of the host in the central processing unit of the host before being amplified by the power amplifier circuit. The principle is that the audio signal is sent to the host central processing unit (CPU). In the host central processing unit, the audio signal is divided into low-frequency signal and high-frequency signal according to the frequency response range, and then the divided two signals are input to the amplification circuit for separate amplification. Its frequency division method is digital.

Passive frequency division is also called passive frequency division. The audio signal is amplified by the power amplifier circuit and then divided by the passive frequency divider, which is input to the corresponding tweeter or woofer. The principle is to filter out the high-frequency sound by the inductive circuit, leaving the low-frequency sound, and then input the low-frequency sound to the low-frequency horn. The electrolytic capacitor filters out the low-frequency sound and leaves the high-frequency sound, which is then input to the tweeter. The frequency division method is fuzzy by the variable resistor adjustment.

Active division must be the host with active frequency division function or the host audio output after the installation of digital active frequency divider.

In fact, many people have used the active horn. The small horn of the walkman is the active horn, that is, a set of expanders are added to the general horn box. When we want to use it, we only need the front stage and not the rear stage. The active interior adopts the electronic sound division method, and saves the trouble of matching the appropriate rear stage; the passive horn is a general horn, and there is only a sound division network in it.

The active front stage is the front stage of IC, transistor and vacuum tube that we generally see. After the input signal is output, it has amplification effect. This front stage can play a high dynamic performance and has different timbre with the characteristics of each model. The passive front stage is the simplest, that is, a volume control attenuator, its output will be less than the input, but the tone rendering situation is less, usually only slightly different, not like the active front stage amplifier quite different.

See here we have to understand what is the sound of the active passive? If there is a need to welcome the call!

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