The difference between active speakers and passive speakers

Active speakers refer to speakers that have the power amplifier inside the speaker and can be directly connected to the sound source and work normally. Some active speakers not only integrate the power amplifier into the speaker, but also integrate the decoder into the speaker, which can directly receive digital signals. , This is the digital active speaker, such as the computer speakers seen on the market.

The amplifier of the passive speaker is independent of the speaker. It can be regarded as a "wooden box plus a speaker". The advantage of this is that the sound can reach the best state and will not be interfered. Because the sound cards of VCD and DVD computers are both Without power amplifier, only output sound analog signal, you need to connect a dedicated power amplifier (power amplifier)

Although literally, an active speaker can be considered a speaker that must be plugged in, but strictly speaking, this "source" should be understood as a power amplifier, not a power supply, because there are many that need to be plugged in but still need to be driven by an external power amplifier. Speakers, these speakers are obviously not active speakers.

The structure of active speakers: The simplest audio system includes 3 links: audio source, power amplifier and speakers.

The audio source refers to the equipment that plays the audio source carrier. Such as radios, decks, CD players, VCDs, DVDs, MP3s, etc., for computers, optical drives and sound cards are all audio source equipment. Generally, the output signal of audio source equipment is small, about hundreds of millivolts to two volts. If you connect the speakers directly, the sound may be very small or even silent, and because the impedance of the speakers is generally very low, most of them are between 4~8 ohms, and some speakers with special designs have an impedance of less than two ohms in some frequency bands. Close to a short circuit, it is easy to overload the audio source equipment, and may eve