Powered speakers

Powered speakers

, the rate of change in audio signals) since cable length is very small in powered speakers. Powered speakers ease set-up issues for an audio system, at least to some extent. However since low-level signal cables have to be run to the speakers from a signal source, noise pick-up can be a problem. This can be reduced (even effectively solved) by incorporating "balanced" line inputs into the speakers. When driven by balanced signals (and cables) from the sound source, noise can be greatly reduced. Some powered speaker manufacturers, notably DB Technologies and Phonic, are now incorporating UHF wireless receivers so the speaker requires only a power lead.

Alternatively, a passive speaker (or unpowered speaker) is a speaker which does not have its own power source and draws power from somewhere else, as opposed to an active speaker which has a built-in amplifier. Active speakers have a short run of cable between the amplifier and the speaker, which reduces signal and power loss. The amplifier can also be matched to the speaker (chiefly an impedance issue) more exactly. Passive speakers are lighter and cheaper, but require longer lengths of cable to run to a separate amplifier. This can be desirable if you have amplifiers that can run multiple speakers.

ervo-driven speakers

By including a negative feedback loop in the amplifier-speaker system, distortion can be substantially reduced. If mounted at the speaker cone, the sensor is usually an accelerometer. It's also possible to monitor the back EMF generated by the driver voice coil as it moves within the magnetic gap. In either case, specialist amplifier designs are needed and so servo speakers are inherently powered speakers.

References

* [http://www.mmproductions.co.uk/faqspe4.html What is a passive speaker?]


Wikimedia Foundation. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • Bose stereo speakers — Bose has been a manufacture of stereo speakers since the 60 s and has a wide range of stereo speakers, TimelineModel numbers that are in bold are speakers currently being sold.List of stereo speakers from [http://www.bose.com/customer… …   Wikipedia

  • Bose computer speakers — The Bose Computer Speaker Systems are the company s computer audio solutions for its consumer electronics lineup.Computer Speaker TimelineThe Computer Speaker Lineup Timeline (in order from earliest to latest) are as follows: *1994 mdash;… …   Wikipedia

  • Wireless speakers — are like normal loudspeakers, but instead of using a cable to transmit the electronic signals carrying the sound information, the signals are transmitted by means of radio frequency (RF) waves.Wireless speakers consist of a main unit which… …   Wikipedia

  • Creative Wireless Speakers — The ZiiSound, Inspire and Creative Wireless Speakers is a range of wireless speakers by Creative Technology, which utilizes Bluetooth technology and apt X audio codec for high quality wireless streaming of audio. Their first wireless speaker, The …   Wikipedia

  • PowerCD — Apple PowerCD was a US$499 CD player sold by Apple Computer in 1993 and discontinued several years later. It was a re badged Philips designed product which was sold in addition to Apple s speakers and also included a remote control. The PowerCD… …   Wikipedia

  • Stage piano — A stage piano is an electronic keyboard designed for use in live onstage performances by professional musicians. While stage pianos share some of the same features as digital pianos designed for in home use and electronic synthesizers, they have… …   Wikipedia

  • Audio power — Sound measurements Sound pressure p, SPL Particle velocity v, SVL Particle displacement ξ Sound intensity I, SIL Sound power Pac Sound power level SWL Sound energy Sound energy density …   Wikipedia

  • PowerBook Duo — Apple PowerBook Duo 2300c with standard CD jewel case, for size comparison. The PowerBook Duo was a line of small subnotebooks manufactured and sold by Apple Computer from 1992 until 1997 as a more compact companion to the PowerBook line.… …   Wikipedia

  • Macintosh — This article is about Apple personal computers. For other uses, see McIntosh. The original Macintosh, the first commercially successful personal computer to use a graphical user interface, rather than a command line …   Wikipedia

  • Mixing console — In professional audio, a mixing console, or audio mixer, also called a sound board, mixing desk, or mixer is an electronic device for combining (also called mixing ), routing, and changing the level, timbre and/or dynamics of audio signals. A… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”