Passive-active acoustic systems
— combined speakers in which the main speakers are passive and the subwoofer is active (respectively, only models with a subwoofer can be included in this category). The meaning of this division is, in particular, that for high-quality sound at low frequencies it is desirable to have a separate amplifier for a subwoofer — and in active "subwoofers" it is already installed, which will save you from having to look for an additional component of the audio system. The features of passive acoustics as a whole are described in detail in the relevant paragraph.
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