Powered speakers

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Powered speakers (or active speakers) are speakers that have built-in amplifiers. They can be connected directly to a mixing console or sound source, without the need for an amplifier. Such speakers are available with passive or active crossovers built into them. Powered speakers avoid the necessity of speaker to amplifier matching and limiting is built in. Another advantage of powered speakers is reduction in slew rate, the slewing of audio signals dependant on the length of speaker cable (negligible in powered speakers) and the impedance of the driver. Powered speakers, to some extent ease the set-up of a system. However since low-level signal cables have to be run to the speakers from the mixer, main console or control centre, noise pick-up can be a problem. This is solved by incorporating "balanced" line inputs into the speakers which are meant to be driven by balanced signals (and cables) from the mixer. Some powered speaker manufacturers, notably DB Technologies and Phonic, are now incorporating UHF wireless receivers so the speaker only requires a power lead.

[edit] See also

Passive speakers

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