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Question:

Why does family theater need amplifier machine?

Why does family theater need amplifier machine? Only TV, VCD, plus a stereo, can't you?

Answer:

Who's going to drive the stereo? Is that VCD? No, you have to have a power amplifier. Two stereo also can not be called home theater, VCD also can not achieve that effect.
TV, VCD power amplifier by cost and volume restrictions, quality and power are slightly worse.
The power amplifier is the power amplification, the amplified audio signal back to passive speaker. Of course, for digital audio signals, the power amplifier also has a function of decoding. Passive speakers can not signal amplification, if the device is directly connected to the passive speaker, because the signal is very small, so the passive speakers will not make a sound, or sound is very small. Of course, some Japanese and Korean manufacturers of low-cost home theater system, its playback device has power amplification function, in fact, players and power amplifier combo, and not without power amplifier. Some also directly play the device connected to the active speaker, the active speaker itself with power amplification, and some also with digital decoding function, so do not connect power amplifier.

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