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How to distinguish active speakers from passive speakers

2021-08-10 42
When choosing speakers, you are always asked whether you need active speakers or passive speakers. What is the difference between the two? How should we choose?

Active speakers:
Active means that there is a group of circuits inside, which has the function of power amplification. For example, most of the speakers used in computers are active speakers, that is to say, they can be used directly by connecting them to the sound card of the computer. No need to go through a special power amplifier. Such speakers are usually marked with parameters such as the output power, input impedance, and input signal level of the built-in amplifier. The active speaker has a built-in power amplifier circuit, which can work when the power supply and signal input are connected.

Passive speakers:
Passive speakers are also called "passive speakers". That is, the speakers we usually see. There is no power amplifier circuit inside the speaker, so an external power amplifier is required. Although passive speakers do not have amplifiers, they often have crossover networks and impedance compensation circuits. At the same time we can also regard it as
"Wooden box + speaker", the advantage of this is that the sound can reach the best state, and will not be disturbed by the external environment. Since the sound card of the playback device does not have a power amplifier and only outputs sound analog signals, a dedicated power amplifier should be connected when using this kind of speakers.

The difference between active speakers and passive speakers


How to distinguish active speakers from passive speakers


In terms of box sound:
Low- and mid-range speakers have a box sound. Good speakers will make you unable to feel the speakers. Passive speakers have more or less sound-absorbing cotton. For cost considerations, active speakers either have no sound-absorbing cotton or very little. Another reason is that the sound-absorbing cotton is too much, and the heat dissipation of the power components in the box becomes a problem. In addition, there is an amplifier circuit in the speaker, so the volume of the left and right speakers will be different, and the sound will also be different.

In terms of power amplification (essential difference):
Passive speakers do not have a built-in power amplifier circuit and must be connected to an external power amplifier to work. The active speaker is externally connected with a built-in power amplifier circuit powered by a power supply, which has sufficient power and can work when the power supply and signal input are connected, without the need for a power amplifier.

In terms of output sound effects:
The integrated sound card has nothing to talk about for the average user in terms of output. The integrated sound card mainly relies on the software debugging of the driver to output sound effects, while the independent sound card is only required for special sound effects to be targeted for purchase, or it is more high-end Has hardware-level debugging capabilities. Therefore, the integrated sound card can also meet the requirements of the vast majority of users. If there is no special requirement, don't buy an independent sound card, and waste money.
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