{"id":2599,"date":"2020-12-07T07:19:24","date_gmt":"2020-12-07T07:19:24","guid":{"rendered":"https:\/\/blogs.qsc.com\/live-sound\/?p=2599"},"modified":"2021-01-07T08:02:47","modified_gmt":"2021-01-07T08:02:47","slug":"what-does-subwoofers-mutual-coupling-mean","status":"publish","type":"post","link":"https:\/\/blogs.qsc.com\/live-sound\/fr\/en-quoi-consiste-le-couplage-mutuel-entre-plusieurs-caissons-de-graves\/","title":{"rendered":"En quoi consiste le couplage mutuel entre plusieurs caissons de graves ?"},"content":{"rendered":"<div class=\"trp_language_switcher_shortcode\">\n<div class=\"trp-language-switcher trp-language-switcher-container\" data-no-translation>\n    <div class=\"trp-ls-shortcode-current-language\">\n        <a href=\"#\" class=\"trp-ls-shortcode-disabled-language trp-ls-disabled-language\" title=\"Fran\u00e7ais\" onclick=\"event.preventDefault()\">\n\t\t\t Fran\u00e7ais\t\t<\/a>\n    <\/div>\n    <div class=\"trp-ls-shortcode-language\">\n                <a href=\"#\" class=\"trp-ls-shortcode-disabled-language trp-ls-disabled-language\"  title=\"Fran\u00e7ais\" onclick=\"event.preventDefault()\">\n\t\t\t Fran\u00e7ais\t\t<\/a>\n                    <a href=\"https:\/\/blogs.qsc.com\/live-sound\/fr\/wp-json\/wp\/v2\/posts\/2599\" title=\"English\">\n             English        <\/a>\n\n            <a href=\"https:\/\/blogs.qsc.com\/live-sound\/fr\/wp-json\/wp\/v2\/posts\/2599\" title=\"Deutsch\">\n             Deutsch        <\/a>\n\n            <a href=\"https:\/\/blogs.qsc.com\/live-sound\/fr\/wp-json\/wp\/v2\/posts\/2599\" title=\"Espa\u00f1ol de M\u00e9xico\">\n             Espa\u00f1ol de M\u00e9xico        <\/a>\n\n        <\/div>\n    <script type=\"application\/javascript\">\n        \/\/ need to have the same with set from JS on both divs. Otherwise it can push stuff around in HTML\n        var trp_ls_shortcodes = document.querySelectorAll('.trp_language_switcher_shortcode .trp-language-switcher');\n        if ( trp_ls_shortcodes.length > 0) {\n            \/\/ get the last language switcher added\n            var trp_el = trp_ls_shortcodes[trp_ls_shortcodes.length - 1];\n\n            var trp_shortcode_language_item = trp_el.querySelector( '.trp-ls-shortcode-language' )\n            \/\/ set width\n            var trp_ls_shortcode_width                                               = trp_shortcode_language_item.offsetWidth + 16;\n            trp_shortcode_language_item.style.width                                  = trp_ls_shortcode_width + 'px';\n            trp_el.querySelector( '.trp-ls-shortcode-current-language' ).style.width = trp_ls_shortcode_width + 'px';\n\n            \/\/ We're putting this on display: none after we have its width.\n            trp_shortcode_language_item.style.display = 'none';\n        }\n    <\/script>\n<\/div>\n<\/div>\n\n\n\n<p>Vous avez s\u00fbrement remarqu\u00e9 que les ing\u00e9nieurs du son live placent souvent les caissons de graves \u00e0 proximit\u00e9 les uns des autres, que ce soit pos\u00e9s par terre, sur le c\u00f4t\u00e9 de la sc\u00e8ne ou en haut du syst\u00e8me de diffusion line array. Une telle disposition pr\u00e9sente-t-elle des avantages ? Et que se passe-t-il exactement ? Avant de r\u00e9pondre \u00e0 ces questions, revoyons quelques bases de la physique du son.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Longueur d'onde sonore<\/strong><\/h3>\n\n\n\n<p class=\"translation-block\">Commen\u00e7ons par un rappel de la d\u00e9finition de la vitesse (\u00ab c\u00e9l\u00e9rit\u00e9 \u00bb) du son \u00ab C \u00bb (au niveau de la mer, \u00e0 21\u00b0 C \/ 70\u00b0 F, dans des conditions atmosph\u00e9riques normales). Elle est d\u00e9finie comme C = f \u03bb, o\u00f9 \u00ab f \u00bb repr\u00e9sente la fr\u00e9quence et \u00ab \u03bb \u00bb la longueur d'onde, et est \u00e9gale \u00e0 344 m\/s (1128 ft\/s).<\/p>\n\n\n\n<p>Qu'est-ce que la longueur d'onde ? En physique, la longueur d'onde correspond \u00e0 la p\u00e9riodicit\u00e9 spatiale des oscillations d'une onde p\u00e9riodique ; autrement dit, la distance au bout de laquelle la forme de l'onde se r\u00e9p\u00e8te. Il s'agit de la distance s\u00e9parant deux points cons\u00e9cutifs correspondant \u00e0 un m\u00eame \u00e9tat de l'onde : par exemple, deux cr\u00eates ou creux successifs, ou deux passages \u00e0 z\u00e9ro.<\/p>\n\n\n\n<p>When a sound propagates through air, the air is compressed or rarefied in waves that travel out from the audio source. When those compressed or rarified areas of air hit your eardrum, it vibrates in sympathy with those compression waves in the air and allows you to hear. The wavelengths of audible frequencies to the human ear (20&nbsp;Hz &#8211; 20&nbsp;kHz) are thus between approximately 17&nbsp;m (55.8 ft) and 17&nbsp;mm (0.0558 ft), respectively.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"351\" src=\"https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Sound-wave-and-wavelength-Encycl.Britannica-1024x351.png\" alt=\"\" class=\"wp-image-2600\" srcset=\"https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Sound-wave-and-wavelength-Encycl.Britannica-1024x351.png 1024w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Sound-wave-and-wavelength-Encycl.Britannica-300x103.png 300w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Sound-wave-and-wavelength-Encycl.Britannica-768x263.png 768w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Sound-wave-and-wavelength-Encycl.Britannica-1536x526.png 1536w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Sound-wave-and-wavelength-Encycl.Britannica-250x86.png 250w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Sound-wave-and-wavelength-Encycl.Britannica-550x188.png 550w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Sound-wave-and-wavelength-Encycl.Britannica-800x274.png 800w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Sound-wave-and-wavelength-Encycl.Britannica-526x180.png 526w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Sound-wave-and-wavelength-Encycl.Britannica-876x300.png 876w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Sound-wave-and-wavelength-Encycl.Britannica-1460x500.png 1460w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Sound-wave-and-wavelength-Encycl.Britannica.png 1600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Ph\u00e9nom\u00e8ne de couplage mutuel<\/strong><\/h3>\n\n\n\n<p>Le couplage mutuel est un ph\u00e9nom\u00e8ne physique qui se produit, th\u00e9oriquement, entre tous les haut-parleurs, quelle que soit leur taille. Cependant, cet article met l'accent sur le couplage mutuel entre les haut-parleurs basse fr\u00e9quence.<\/p>\n\n\n\n<p>On parle de couplage mutuel lorsqu'au moins deux haut-parleurs reproduisent le m\u00eame signal, que leurs centres acoustiques sont proches et qu'ils sont orient\u00e9s dans la m\u00eame direction pour des longueurs d'onde inf\u00e9rieures \u00e0 la distance qui s\u00e9pare leurs centres acoustiques. Dans ce cas, la pression acoustique combin\u00e9e se propage vers l'avant sous la forme d\u2019une seule forme d'onde, comme si tous les haut-parleurs agissaient comme un seul haut-parleur de plus grande taille.<\/p>\n\n\n\n<p><br>Si on ne prend en compte que deux haut-parleurs, leurs centres acoustiques doivent \u00eatre proches, \u00e0 une distance situ\u00e9e entre le 1\/4 et la 1\/2 de la longueur d'onde de la fr\u00e9quence qu'ils reproduisent. Plus la longueur d'onde est courte (hautes fr\u00e9quences), plus la distance qui s\u00e9pare les deux centres acoustiques doit \u00eatre r\u00e9duite pour permettre le couplage mutuel.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"659\" height=\"214\" src=\"https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Fig-1.-Drivers-Mutual-Coupling-Effect.jpg\" alt=\"\" class=\"wp-image-2601\" srcset=\"https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Fig-1.-Drivers-Mutual-Coupling-Effect.jpg 659w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Fig-1.-Drivers-Mutual-Coupling-Effect-300x97.jpg 300w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Fig-1.-Drivers-Mutual-Coupling-Effect-250x81.jpg 250w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Fig-1.-Drivers-Mutual-Coupling-Effect-550x179.jpg 550w, https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Fig-1.-Drivers-Mutual-Coupling-Effect-554x180.jpg 554w\" sizes=\"(max-width: 659px) 100vw, 659px\" \/><figcaption><em>Illustration 1 : (\u00e0 gauche) Aucun couplage mutuel des haut-parleurs car leurs centres acoustiques sont s\u00e9par\u00e9s par une distance sup\u00e9rieure \u00e0 1\/2 longueur d'onde. (\u00c0 droite) Le couplage mutuel se produit car les centres acoustiques des haut-parleurs sont s\u00e9par\u00e9s par une distance inf\u00e9rieure \u00e0 1\/2 longueur d'onde. (R\u00e9f\u00e9rence des images: www.bnoack.com).<\/em>.<\/figcaption><\/figure>\n\n\n\n<p>Regardons maintenant deux situations diff\u00e9rentes. Tout d'abord, si nous installons deux haut-parleurs l'un \u00e0 c\u00f4t\u00e9 de l'autre \u00e0 une distance sup\u00e9rieure \u00e0 une demi-longueur d'onde de la fr\u00e9quence reproduite, la sortie moyenne dans l'axe et hors axe mesur\u00e9e atteint jusqu'\u00e0 3 dB (le double de la puissance). En revanche, avec deux haut-parleurs suffisamment proches pour b\u00e9n\u00e9ficier de l'effet de couplage mutuel, le niveau de sortie mesur\u00e9 atteint jusqu'\u00e0 6 dB de plus.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Application des avantages<\/strong><\/h3>\n\n\n\n<p>Afin d'illustrer le ph\u00e9nom\u00e8ne expliqu\u00e9 ci-dessus, regardons les sp\u00e9cifications du caisson de graves actif KS118 de QSC. Sa r\u00e9ponse en fr\u00e9quence (\u00e0 -6 dB) s'\u00e9tend de 41 Hz \u00e0 98 Hz. Ainsi, comme mentionn\u00e9 pr\u00e9c\u00e9demment, pour calculer la longueur d'onde la plus courte (en utilisant la formule C = f \u03bb), nous devons prendre en compte la fr\u00e9quence la plus \u00e9lev\u00e9e que le caisson de graves peut produire.<\/p>\n\n\n\n<p class=\"translation-block\">\u00bd longueur d'onde \u00e0 98 Hz = 1,75 m (5,7 ft)<\/p>\n\n\n\n<p>Par cons\u00e9quent, tant que deux caissons de graves KS118 ont leurs centres acoustiques plac\u00e9s \u00e0 une distance inf\u00e9rieure ou \u00e9gale \u00e0 1,75 m (5,7 ft), le ph\u00e9nom\u00e8ne de couplage mutuel se produira, offrant un niveau de sortie suppl\u00e9mentaire de 6 dB.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Conclusion<\/strong><\/h3>\n\n\n\n<p>Comme on peut le constater, il est relativement simple de profiter du couplage mutuel avec des caissons de graves. Ils peuvent facilement \u00eatre plac\u00e9s \u00e0 proximit\u00e9 les uns des autres, \u00e0 une distance bien inf\u00e9rieure \u00e0 une demi longueur d'onde de la fr\u00e9quence la plus \u00e9lev\u00e9e qu'ils peuvent reproduire. La possibilit\u00e9 d'obtenir un niveau de pression acoustique \u00e9lev\u00e9 \u00e0 basses fr\u00e9quences avec un nombre r\u00e9duit de caissons de graves, incite les organisateurs de tourn\u00e9es, soci\u00e9t\u00e9s de production, DJ ou encore installateurs, \u00e0 rapprocher les caissons de graves. Une fa\u00e7on intelligente d'obtenir des d\u00e9cibels suppl\u00e9mentaires, gratuitement !<\/p>","protected":false},"excerpt":{"rendered":"<p>Vous avez s\u00fbrement remarqu\u00e9 que les ing\u00e9nieurs du son live placent souvent les caissons de graves \u00e0 proximit\u00e9 les uns des autres, que ce soit pos\u00e9s par terre, sur le c\u00f4t\u00e9 de la sc\u00e8ne ou en haut du syst\u00e8me de diffusion line array. Une telle disposition pr\u00e9sente-t-elle des avantages ?... <a href=\"https:\/\/blogs.qsc.com\/live-sound\/fr\/en-quoi-consiste-le-couplage-mutuel-entre-plusieurs-caissons-de-graves\/\">Read More<\/a><\/p>","protected":false},"author":29,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,18,79,14,63,59,19,58],"tags":[121,160,107,122,123,124,60,44,161,112,61],"class_list":["post-2599","post","type-post","status-publish","format-standard","hentry","category-av-rental-presentation","category-djs-dance","category-educational","category-events","category-house-of-worship","category-ks212c","category-musicians-bands","category-subwoofers","tag-active-subwoofers","tag-french","tag-german","tag-ks-series","tag-ks112","tag-ks118","tag-ks212c","tag-live-sound","tag-mutual-coupling","tag-spanish","tag-subwoofers"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What does Subwoofers Mutual Coupling Mean - Blog | Resources<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.qsc.com\/live-sound\/fr\/what-does-subwoofers-mutual-coupling-mean\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What does Subwoofers Mutual Coupling Mean - Blog | Resources\" \/>\n<meta property=\"og:description\" content=\"You will have noticed that in a large number of live events, sound engineers place subwoofers close together either on the floor, on the side of the stage, or at the top of the line-array rig. 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Before exploring the answer, let\u2019s first recall some &hellip; Read More\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.qsc.com\/live-sound\/fr\/what-does-subwoofers-mutual-coupling-mean\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog | Resources\" \/>\n<meta property=\"article:published_time\" content=\"2020-12-07T07:19:24+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-01-07T08:02:47+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Sound-wave-and-wavelength-Encycl.Britannica-1024x351.png\" \/>\n<meta name=\"author\" content=\"Christophe Anet\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Christophe Anet\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blogs.qsc.com\/live-sound\/what-does-subwoofers-mutual-coupling-mean\/\",\"url\":\"https:\/\/blogs.qsc.com\/live-sound\/what-does-subwoofers-mutual-coupling-mean\/\",\"name\":\"What does Subwoofers Mutual Coupling Mean - Blog | Resources\",\"isPartOf\":{\"@id\":\"https:\/\/blogs.qsc.com\/live-sound\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blogs.qsc.com\/live-sound\/what-does-subwoofers-mutual-coupling-mean\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blogs.qsc.com\/live-sound\/what-does-subwoofers-mutual-coupling-mean\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Sound-wave-and-wavelength-Encycl.Britannica-1024x351.png\",\"datePublished\":\"2020-12-07T07:19:24+00:00\",\"dateModified\":\"2021-01-07T08:02:47+00:00\",\"author\":{\"@id\":\"https:\/\/blogs.qsc.com\/live-sound\/#\/schema\/person\/a8866d0b07d2d57a44a4940d6e2dc4a0\"},\"breadcrumb\":{\"@id\":\"https:\/\/blogs.qsc.com\/live-sound\/what-does-subwoofers-mutual-coupling-mean\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/blogs.qsc.com\/live-sound\/what-does-subwoofers-mutual-coupling-mean\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/blogs.qsc.com\/live-sound\/what-does-subwoofers-mutual-coupling-mean\/#primaryimage\",\"url\":\"https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Sound-wave-and-wavelength-Encycl.Britannica-1024x351.png\",\"contentUrl\":\"https:\/\/blogs.qsc.com\/app\/uploads\/sites\/3\/2020\/12\/Sound-wave-and-wavelength-Encycl.Britannica-1024x351.png\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/blogs.qsc.com\/live-sound\/what-does-subwoofers-mutual-coupling-mean\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/blogs.qsc.com\/live-sound\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"What does Subwoofers Mutual Coupling Mean\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/blogs.qsc.com\/live-sound\/#website\",\"url\":\"https:\/\/blogs.qsc.com\/live-sound\/\",\"name\":\"Blog | Resources\",\"description\":\"QSC\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/blogs.qsc.com\/live-sound\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-FR\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/blogs.qsc.com\/live-sound\/#\/schema\/person\/a8866d0b07d2d57a44a4940d6e2dc4a0\",\"name\":\"Christophe Anet\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/blogs.qsc.com\/live-sound\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/c8477b4735e81f241edc3cc5da4d26cba5c0f45cabc80bb23e9ab99ff47335da?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/c8477b4735e81f241edc3cc5da4d26cba5c0f45cabc80bb23e9ab99ff47335da?s=96&d=mm&r=g\",\"caption\":\"Christophe Anet\"},\"description\":\"Christophe Anet is an electroacoustics engineer and live sound professional. Over the years, his passion for acoustics led him to design recording studios, lecture about psycho-acoustics and calibrate recording studio control rooms around the world. 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