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Bluetooth speaker manufacturers literacy: What is active speakers?
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Edit: Click: 3927 Date: 2016-09-30
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Like nothing to listen to music more and more friends, good sound from China and other TV programs, similar to sing it and other mobile phone app, square dance, etc., we can see that with the great improvement in people's lives, the proportion of spending for entertainment is also improve. I believe many people have bought a friend speaker, used more friends. There should be many people will find the speaker configuration parameters are active or passive above the argument. What is the active speaker in the end it? Is there a power supply? of course not.
As we all know, a simple speaker system generally include: audio, power amplifier (amplifier) and speakers.
Sound source well understood, the source of sound, like mobile phones, MP3, radio, DVD, etc. are considered a sound source. But like mobile phones, MP3 and the like the power of the audio equipment is very small, if the direct access speakers, the sound may be small or simply can not hear.
And because the speaker impedance is generally very low, the vast majority of 4 to 8 ohms, some of the more special design of the speaker in some bands of impedance or even less than two ohms, close to short circuit, easy to make audio equipment overload, serious And even may cause damage to the sound source equipment.Therefore, you must add a power amplifier between the sound source and the speaker (referred to as amplifier), the sound output of the weak signal amplified to sufficient power to promote the speaker, the speaker to issue enough volume. Amplifier has a high input impedance (usually tens of kilohms) and a lower output impedance (zero a few ohms), you can play in the source and the buffer between the role of the speaker, will not make the audio equipment overload, but also easily Push the speaker.
Active speaker refers to the kind of integrated amplifier of the speaker, you can directly and mobile phones and other audio equipment to connect and work the sound. Some of the active speakers not only integrates the power amplifier into the speaker, but also integrates the decoder into the interior of the loudspeaker, which can accept digital signals directly, which is the digital active speaker.Therefore, the "source" should be understood. And that need external power amplifier, it is obviously not an active speaker.
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