When we buy a home theater, speakers are essential equipment. When choosing speakers, sales staff will ask me whether I need passive speakers or active speakers. So what are passive speakers and active speakers? What is the difference between these two speakers? Today, I will introduce to you what passive and active speakers are, and analyze the difference between the two speakers.
What is a passive speaker? Passive speakers are also called "passive speakers". That is, the speakers we usually see. There is no power amplifier circuit inside the speaker, and 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 a "wood box + horn", so that the advantage 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.
What is an active speaker? The active speaker has a built-in power amplifier circuit, which can work when the power supply and signal input are connected. 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 difference between passive speakers and active speakers is one: in terms of power amplification (the essential difference between passive speakers and active speakers) 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 power amplifier.
Difference 2: 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 targeted for special sound effects. Buying, or higher-end hardware-level debugging functions. 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.
Difference three: In terms of box sound, low- and mid-range speakers have box sound. Good speakers make you not feel the speakers. Passive speakers have more or less sound-absorbing cotton. Active speakers are out of cost, or they don’t. There are either few sound-absorbing cottons, and another reason is that too many sound-absorbing cottons are placed, 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.