What is an active speaker?
Because of the built-in power amplifier circuit, users do not have to consider the matching problem with the power amplifier, and it is also convenient to drive directly with low-level audio signals. Active speaker refers to a speaker with its own power amplifier. These amplifiers are specially used to drive the speakers in the speakers. Due to the special matching design, these power amplifiers can be used to drive the speakers in the sound box, and users do not have to consider the power of the power amplifiers or the impedance matching. In addition, because the speaker is also equipped with an electronic frequency divider, the frequency is divided before the amplifiers, and each amplifier is only responsible for amplifying the audio signal of a certain frequency, so the efficiency of the amplifier can often be higher and the distortion can be relatively smaller.
Similarity comparison
Passive loudspeaker
A passive speaker is also called a passive speaker. Passive speakers are ordinary speakers we usually use, and there is no power amplifier circuit inside. Although passive speakers do not have amplifiers, they usually have frequency division networks and impedance compensation circuits.
Active speakers are usually marked with the output power, input impedance and input signal level of the built-in amplifier. The active ultra-low speaker also marks the frequency characteristics of the input signal (such as full-band signal or low-frequency signal), low-pass filter characteristics and other parameters. Passive speakers are generally marked with parameters such as impedance, power and frequency range.
Active loudspeaker
To say what an active speaker is, we must first say the composition of the sound system. The simplest sound system includes sound source, power amplifier and speaker. Audio source refers to radio, card stand, CD player, VCD, DVD, MP3 and other sound playing equipment. For computers, optical drives and sound cards are sound source devices. Generally, the output signal of sound source equipment is very small, ranging from several hundred millivolts to two volts. If you connect the speakers directly, the sound may be very small or even no sound at all. Moreover, because the impedance of speakers is generally very low, most of them are between 4 and 8 ohms, some specially designed speakers are even less than two ohms in some frequency bands, which is close to short circuit, which is easy to overload the sound source equipment and even cause damage to the sound source equipment in serious cases. Therefore, it is necessary to add a power amplifier (power amplifier for short) between the sound source and the speaker to amplify the weak signal output by the sound source to enough power to push the speaker and make the speaker emit enough volume. At the same time, the power amplifier has high input impedance (generally tens of thousands of ohms) and low output impedance (tens of ohms), which can play a buffering role between the sound source and the speaker without overloading the sound source equipment and easily pushing the speaker.
Active speaker price
Rambler/rambler E 1 100PLUS desktop computer audio active notebook speaker subwoofer 329.00 yuan.
Microlab/ Mai Bo TMN- 1U active speaker 2. 1 subwoofer USB flash drive mobile phone TV desktop computer stereo 288.00 yuan.
What is an active speaker and the price of the active speaker? Bian Xiao will explain it here. If you want to buy an active speaker, you can read this article by Bian Xiao.