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What is an active speaker?

2021-04-19 422
1. The price is relatively easy to accept
The case of an independent external power amplifier should have sufficient mechanical strength and good shielding. The cost of some well-made cases often reaches 15-20% of the total cost. The power amplifier of the active speaker is set inside the speaker, which has one less casing than the power amplifier, and the cost can be greatly reduced. In terms of power amplifier circuits, external power amplifiers generally use discrete components, which have better sound quality but higher cost, complex installation and debugging, and greater production difficulties. Active speakers generally use power integrated circuits, which are low in price, simple in design, generally do not need to be debugged, and have complete protection functions and are easy to mass produce. This further reduces the cost of active speakers. In terms of wire, the price of excellent audio wire is quite expensive. Active speakers only need one speaker cable, while ordinary speakers need at least one pair, which in turn reduces the cost of active speakers a lot.

2. Simple to connect and easy to use
Active speakers greatly simplifies the audio system, so the connection is simple, only a walkman and a pair of active speakers can form the simplest audio system, and there are only two connections.

3. Eliminate the trouble of matching

The matching of audio equipment is very important, especially the matching of amplifiers and speakers. There are many manufacturers of audio equipment with different styles. If matched properly, the styles of each equipment can complement each other and produce a satisfactory sound. If it is not matched properly, it is either harsh or soft as mud. It is very difficult for ordinary consumers to be familiar with the characteristics of many manufacturers' equipment. The power amplifier and speakers of active speakers are produced by the same manufacturer, and sometimes even designed by the same person. The matching problem can be solved before leaving the factory, saving users the trouble.

What is an active speaker?

★The composition of active speakers
The composition of active speakers can be divided into active and passive parts. The active part is mainly composed of power amplifier components and power transformers. The power amplifier component is used to amplify the music signal and realize various control functions, and the power transformer provides power for the power amplifier component. The passive part mainly includes speakers, crossovers and speaker cabinets.
The loudspeaker is the final sounding device of the entire audio system. At present, most active loudspeakers use a moving coil design, which is simple in structure, low in cost and good in performance. However, it is difficult to take into account the different requirements of the loudspeaker for the treble and bass, so it must be used. The two units for treble and bass respectively provide good sound quality and ensure the integrity of the frequency band. The playback frequency of the woofer is generally between 20 and 6000 Hz, and the aperture is mostly between 3 and 8 inches. The tweeter is generally small in size, with a playback frequency of 1500-25000 Hz, and a diaphragm diameter of 12-25 mm.
The function of the crossover is to distribute the signal to the tweeter and woofer according to the frequency. High-level designers can also use the crossover to adjust the tone of the sound. Another function of the frequency divider is to prevent the high-power low-frequency signal from damaging the tweeter. Generally, low- and mid-range active speakers only use the simplest single-capacitor frequency divider, which has low cost but poor effect, while high-quality speakers are equipped with real crossovers that are carefully designed and adjusted and composed of multiple components.
The main function of the box is to prevent the occurrence of "acoustic short circuit". The phenomenon of "acoustic short circuit" means that the sound waves emitted from the front and back of the speaker are cancelled out due to the similar phase, which mainly occurs in the low frequency range. If the speaker is not installed on the speaker, there is no bass. The function of the cabinet is to isolate the sound waves on both sides of the speaker to avoid the phenomenon of "acoustic short circuit".
The combination of speakers, crossovers and cabinets is the top priority of active speakers and is a decisive factor in the sound quality of active speakers. For multimedia active speakers, this combination determines more than 70% of the sound quality of the speakers.
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