Dipole speaker (original) (raw)
A dipole speaker enclosure in its simplest form is constructed by mounting a loudspeaker driver on a flat panel. The panel may be folded to conserve space. The term dipole derives from the fact that the polar response consists of two lobes, with equal radiation forwards and backwards, and none perpendicular to the axis. (By comparison a monopole response consists of one lobe.) This can be useful in reducing the stimulation of resonant room modes at low frequencies. It also results in high frequencies being reflected from any rear wall, which can enhance the naturalness of the sound in typical listening rooms by creating more diffuse reverberation, though in theory it could detract from stereo localization. For this reason dipole speakers are often used as surround channel speakers, where a
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| dbo:abstract | A dipole speaker enclosure in its simplest form is constructed by mounting a loudspeaker driver on a flat panel. The panel may be folded to conserve space. The term dipole derives from the fact that the polar response consists of two lobes, with equal radiation forwards and backwards, and none perpendicular to the axis. (By comparison a monopole response consists of one lobe.) This can be useful in reducing the stimulation of resonant room modes at low frequencies. It also results in high frequencies being reflected from any rear wall, which can enhance the naturalness of the sound in typical listening rooms by creating more diffuse reverberation, though in theory it could detract from stereo localization. For this reason dipole speakers are often used as surround channel speakers, where a diffuse sound is desired to create ambience. A dipole speaker works by creating air movement (as sound pressure waves) directly from the front and back surfaces of the driver, rather than by impedance matching one or both outputs to the air. As a result, diaphragm motion is constrained primarily by the driver's restoring force (e.g., diaphragm suspension) and not by acoustic loading from an enclosure. This implies that cone motion will be larger at the same output level than in a more usual enclosure, and that power handling will be accordingly limited. Especially at lower frequencies, dipole drivers tend to be large and flat, and necessarily open at both front and back. Common examples include electrostatic or ribbon drivers, though a conventional cone driver mounted in an open baffle also works as a dipole loudspeaker. All of these variations are characterised by a "figure-of-eight" radiation pattern in which the loudness falls towards the sides of the enclosure where interference between front and back waves is maximized. Sometimes the enclosure is modified into an "H-frame" with the driver located on a wall dividing two open compartments. Such enclosures require some control over the radiated sound from the rear of the enclosure to achieve the desired response. This is usually done by mounting two drivers, one over the other, in a push-pull configuration. Some of the speaker cabinets referred to as dipolar arrange the two poles at an angle of about 90 degrees rather than 180 degrees, especially for wall-mounted rear speakers (e.g. Jamo C-80-SUR, Castle dipoles, and Theophany S4). (en) Een dipoolluidspreker (of in het Engels: OB= Open Baffle) is de eenvoudigste uitvoering van een luidspreker en mag geen box worden genoemd, men spreekt liever van een paneel (klankboord, Engels: Baffle) omdat er geen kast(box) omheen zit.Het duidelijkst is de elektrostatische uitvoering, maar ook met gewone elektrodynamische luidsprekers zijn prima dipolen te maken. Zoals bij luidspreker al beschreven staat, schermt men met een box het uitfase-signaal aan de achterkant van de luidspreker af, maar als men dit niet doet, is er een dipool. In onderstaande grafiek staat in het groen de frequentierespons van een typische 10 inch (ca. 25cm) woofer in een zeer groot klankbord geplot, in het blauw dezelfde woofer in een klein paneel, waar het signaal van de achterkant interfereert met het signaal aan de voorkant met een weglengte-verschil van ca. 25 cm. Indien men dit paneel in een reflecterende ruimte plaatst komen er extra signalen bij, die zoals in het rood, de dalen compenseren. Verder kan dit effect bevorderd worden door een uitgekiende paneelafmeting en de juiste plaatsing in de luisterruimte. In de praktijk wordt de frequentie-karakteristiek nog vlakker gemaakt door speciale scheidingsfilters en toevoeging van extra luidsprekers voor midden en hoog. Omdat het geluid samengesteld wordt uit meerdere (virtuele) bronnen, wordt een zeer ruimtelijk effect bereikt, dat door veel audiofielen gewaardeerd wordt, maar er is wel veel ruimte nodig om dit te bereiken. (nl) |
| dbo:thumbnail | wiki-commons:Special:FilePath/Dipole_speaker.gif?width=300 |
| dbo:wikiPageExternalLink | http://www.forsman.no/cms/ http://www.linkwitzlab.com/frontiers.htm%23L https://www.soundmaxpro.com/best-bipolar-speakers/ http://www.linkwitzlab.com/x-models.htm%23B http://www.daudio.nl https://web.archive.org/web/20110718144913/http:/www.avreview.co.uk/news/article/mps/UAN/147/V/2/ |
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| rdfs:comment | A dipole speaker enclosure in its simplest form is constructed by mounting a loudspeaker driver on a flat panel. The panel may be folded to conserve space. The term dipole derives from the fact that the polar response consists of two lobes, with equal radiation forwards and backwards, and none perpendicular to the axis. (By comparison a monopole response consists of one lobe.) This can be useful in reducing the stimulation of resonant room modes at low frequencies. It also results in high frequencies being reflected from any rear wall, which can enhance the naturalness of the sound in typical listening rooms by creating more diffuse reverberation, though in theory it could detract from stereo localization. For this reason dipole speakers are often used as surround channel speakers, where a (en) Een dipoolluidspreker (of in het Engels: OB= Open Baffle) is de eenvoudigste uitvoering van een luidspreker en mag geen box worden genoemd, men spreekt liever van een paneel (klankboord, Engels: Baffle) omdat er geen kast(box) omheen zit.Het duidelijkst is de elektrostatische uitvoering, maar ook met gewone elektrodynamische luidsprekers zijn prima dipolen te maken. Zoals bij luidspreker al beschreven staat, schermt men met een box het uitfase-signaal aan de achterkant van de luidspreker af, maar als men dit niet doet, is er een dipool. (nl) |
| rdfs:label | Dipole speaker (en) Dipoolluidspreker (nl) |
| owl:sameAs | freebase:Dipole speaker wikidata:Dipole speaker dbpedia-nl:Dipole speaker dbpedia-simple:Dipole speaker https://global.dbpedia.org/id/4j72y yago-res:Dipole speaker |
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| is dbo:wikiPageDisambiguates of | dbr:Dipole_(disambiguation) |
| is dbo:wikiPageRedirects of | dbr:Dipole_loudspeaker dbr:Dipole_radiator dbr:Dipole_speakers |
| is dbo:wikiPageWikiLink of | dbr:Bowers_&_Wilkins dbr:Magnepan dbr:Magnetostatic_loudspeaker dbr:Veritone_Minimum_Phase_Speakers dbr:Dipole_(disambiguation) dbr:Dipole_loudspeaker dbr:Dipole_radiator dbr:Dipole_speakers |
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