本帖最后由 tanlwowo 于 2012-9-21 15:37 编辑
Bookshelf speakerFrom Wikipedia, the free encyclopedia
A bookshelf loudspeaker (or bookshelf speaker) is a compact loudspeaker, generally sold for consumer-grade home audio applications as part of a shelf stereo pair or home theater package, that is compact in size and intended to be placed on a raised surface, e.g. a bookshelf.
Powered speakers From Wikipedia, the free encyclopedia
An active full-range loudspeakerPowered speakers, also known as self-powered speakers and active speakers, are loudspeakers that have built-in amplifiers. They can be connected directly to a mixing console or other low-level audio signal source without the need for an external amplifier. Active speakers may have greater fidelity, less intermodulation distortion (IMD), higher dynamic range and greater output sound pressure level (SPL) with fewer blown drivers.[1] Disadvantages include heavier loudspeaker enclosures, reduced reliability due to active electronic components within, and the need of a source of electrical power (other than the audio signal).
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