- Feb 18, 2020-
Passive speakers are also known as "passive speakers". That's what we normally see in speakers. There is no power amplifier circuit inside the speaker, so an external power amplifier is needed. Passive speakers do not have amplifiers, but they often have divider networks and impedance compensation circuits. At the same time, we can also think of it as "wooden box + horn", which has the advantage that the sound can reach the best condition and will not be disturbed by the external environment. Since the sound card of the player does not have a power amplifier, only the output sound analog signal, so the use of this kind of speaker should be connected to a special power amplifier. The power amplifier circuit is built into the active speaker, which can be operated by connecting the power supply and signal input. An active source is a set of internal circuits that amplify power. For example, most of the speakers used on the computer are active speakers, that is, directly connected to the computer's sound card, it can be used. Instead of going through a special power amplifier. The speakers are usually labeled with the output power, input impedance, and input signal parity parameters of the built-in amplifier.
The difference between passive and active speakers
Difference 1: power amplification (essential difference between passive and active speakers)
The passive speaker has no built-in power amplifier circuit and must be equipped with an external power amplifier to work. The active speaker is connected with the power supply internal power amplifier circuit, the power is sufficient, the power is connected and the signal input can work, do not need the power side amplifier.
Difference two: in the output of sound effects
The integrated sound card has nothing to talk about in terms of output for the general user. The integrated sound card mainly relies on the driven software debugging to output sound effects, while the independent sound card is targeted to purchase special sound effects only if it has requirements, or it is equipped with hardware level debugging functions at a higher end. Therefore, the integrated sound card can also meet the requirements of the majority of users. Don't waste your money by buying a separate sound card unless you have special requirements.
Distinction three: in the box sound respect
Medium and low grade speakers have box sound, good speakers put out so that you can not feel the speaker, passive speakers more or less have sound-absorbing cotton, active speakers for cost considerations, either no sound-absorbing cotton, or very little, there is a reason is sound-absorbing cotton put more, the power element in the box heat dissipation problem. In addition, there is an amplifier circuit in the speaker, so the volume of the left and right speakers will be different, the sound will be different.