{"id":970,"date":"2025-09-15T14:48:19","date_gmt":"2025-09-15T18:48:19","guid":{"rendered":"https:\/\/groupecsx.ca\/?p=970"},"modified":"2025-12-09T11:34:24","modified_gmt":"2025-12-09T15:34:24","slug":"demystifying-70-volt-sound-systems-between-technical-reality-and-preconceived-notions","status":"publish","type":"post","link":"https:\/\/groupecsx.ca\/en\/demystifier-les-systemes-de-sonorisation-a-70-volts-entre-realite-technique-et-idees-recues\/","title":{"rendered":"Demystifying 70-volt sound systems: between technical reality and preconceived notions"},"content":{"rendered":"\n

Les syst\u00e8mes de haut-parleurs distribu\u00e9s \u00e0 70 volts sont omnipr\u00e9sents dans presque tous types de b\u00e2timents et installations industrielles. Pourtant, ils sont aussi entour\u00e9s de nombreux mythes, approximations et simplifications. Il est essentiel de r\u00e9tablir les faits techniques afin de garantir des conceptions fiables et conformes.<\/p>\n\n\n\n

1. 70 volts ou 70.7 volts ?<\/h5>\n\n\n\n

La bonne valeur est 70.7 volts RMS<\/strong>. Ce chiffre n\u2019est pas arbitraire : il correspond \u00e0 une tension cr\u00eate de 100 volts PEAK<\/strong>, soit 70.7 V RMS = 100 V \/ \u221a2 (\u00e0 ne pas confondre avec les syst\u00e8mes distribu\u00e9s \u00e0 100v RMS!)<\/em>. Cependant, dans la pratique, cette tension est rarement atteinte. Elle repr\u00e9sente le maximum en sortie d\u2019amplificateur (\u00e0 pleine puissance), et non une tension constante sur la ligne audio.<\/p>\n\n\n\n

2. Pourquoi parle-t-on de \u201ctension constante\u201d ?<\/h5>\n\n\n\n

Le terme \u00a0\u00bbConstant Voltage\u00a0\u00bb est trompeur, car la tension varie selon le signal audio. Ce n\u2019est pas une ligne de 70 V fixes, mais une ligne \u00e0 tension alternative (AC) audio, dont l\u2019amplitude varie constamment. Le vrai avantage de ces syst\u00e8mes est la constance de l’imp\u00e9dance vue par l’amplificateur, car tous les haut-parleurs utilisent des transformateurs. Cela permet de simplifier la charge sur l\u2019amplificateur et de faciliter le c\u00e2blage parall\u00e8le de plusieurs haut-parleurs.<\/p>\n\n\n\n

3. Un haut-parleur 70V n\u2019existe pas\u2026 vraiment<\/h5>\n\n\n\n

Ce qu\u2019on appelle \u00ab\u00a0haut-parleur 70V\u00a0\u00bb est en fait un haut-parleur traditionnel (souvent 8 ohms) auquel est int\u00e9gr\u00e9 un transformateur. Ce transformateur permet de pr\u00e9lever une fraction de la puissance via un \u201ctap\u201d (ex. : 1 W, 5 W, 15 W), tout en maintenant une imp\u00e9dance adapt\u00e9e au syst\u00e8me global. Ce sont donc les transformateurs qui forment le c\u0153ur du syst\u00e8me distribu\u00e9, pas les haut-parleurs eux-m\u00eames.<\/p>\n\n\n\n

4. Courant alternatif et Classe 2 : o\u00f9 est la limite ?<\/h5>\n\n\n\n

La tension de 70.7 V RMS est alternatif (AC), et elle est encore consid\u00e9r\u00e9e comme Classe 2 car la puissance totale est limit\u00e9e. Cela permet de r\u00e9duire les contraintes de s\u00e9curit\u00e9 tant que l’installation respecte ces limites. Toutefois, plusieurs syst\u00e8mes modernes d\u00e9passent les puissances de Classe 2, ce qui exige une conformit\u00e9 \u00e0 Classe 1 (c\u00e2bles sous conduits, protection des circuits, etc.).<\/p>\n\n\n\n

5. Non, vous ne pouvez pas faire 500 m\u00e8tres avec du 22 AWG\u2026<\/h5>\n\n\n\n

Un mythe persistant pr\u00e9tend que les syst\u00e8mes \u00e0 70V permettent des distances illimit\u00e9es avec du c\u00e2ble de tr\u00e8s petit calibre. C\u2019est faux! Comme pour tout syst\u00e8me audio, la perte de tension (et donc de signal) augmente avec la longueur du c\u00e2ble et la r\u00e9sistance du conducteur.<\/p>\n\n\n\n

Mais plus important encore : <\/strong>les pertes s\u2019expriment en d\u00e9cibels (dB). C\u2019est la perte en niveau de la puissance sonore qui compte, pas seulement le voltage. Un c\u00e2ble trop long ou avec un gabarit trop petit peut engendrer une perte audible, m\u00eame si le syst\u00e8me fonctionne \u201ctechniquement\u201d.<\/p>\n\n\n\n

\ud83d\udca1 Pour les curieux : La perte en d\u00e9cibels (dB) se calcule en prenant dix fois le logarithme d\u00e9cimal de [1 + (2 \u00d7 r\u00e9sistance aller-retour du c\u00e2ble \u00f7 imp\u00e9dance du syst\u00e8me)]<\/em>.<\/p>\n\n\n\n

Mais pas de souci\u2026 on s\u2019occupe des calculs pour vous \ud83d\ude09<\/p>\n\n\n\n

Conclusion : rigueur et planification avant tout<\/h5>\n\n\n\n

Les syst\u00e8mes 70V sont puissants, efficaces, et adapt\u00e9s aux grands b\u00e2timents, \u00e0 condition de bien comprendre leur fonctionnement. Il est temps de d\u00e9passer les raccourcis et les croyances h\u00e9rit\u00e9es d\u2019une \u00e9poque o\u00f9 les installations reposaient souvent sur des pratiques empiriques non document\u00e9es!<\/p>\n","protected":false},"excerpt":{"rendered":"

Les syst\u00e8mes de haut-parleurs distribu\u00e9s \u00e0 70 volts sont omnipr\u00e9sents dans presque tous types de b\u00e2timents et installations industrielles. Pourtant, ils sont aussi entour\u00e9s de nombreux mythes, approximations et simplifications. Il est essentiel de r\u00e9tablir les faits techniques afin de garantir des conceptions fiables et conformes. 1. 70 volts ou 70.7 volts ? La bonne […]<\/p>\n","protected":false},"author":1,"featured_media":971,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[],"class_list":["post-970","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites"],"yoast_head":"\nD\u00e9mystifier les syst\u00e8mes de sonorisation \u00e0 70 volts : entre r\u00e9alit\u00e9 technique et id\u00e9es re\u00e7ues - Groupe CSX inc.<\/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:\/\/groupecsx.ca\/en\/demystifying-70-volt-sound-systems-between-technical-reality-and-preconceived-notions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"D\u00e9mystifier les syst\u00e8mes de sonorisation \u00e0 70 volts : entre r\u00e9alit\u00e9 technique et id\u00e9es re\u00e7ues - Groupe CSX inc.\" \/>\n<meta property=\"og:description\" content=\"Les syst\u00e8mes de haut-parleurs distribu\u00e9s \u00e0 70 volts sont omnipr\u00e9sents dans presque tous types de b\u00e2timents et installations industrielles. Pourtant, ils sont aussi entour\u00e9s de nombreux mythes, approximations et simplifications. Il est essentiel de r\u00e9tablir les faits techniques afin de garantir des conceptions fiables et conformes. 1. 70 volts ou 70.7 volts ? 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Pourtant, ils sont aussi entour\u00e9s de nombreux mythes, approximations et simplifications. Il est essentiel de r\u00e9tablir les faits techniques afin de garantir des conceptions fiables et conformes. 1. 70 volts ou 70.7 volts ? 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