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</header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Site"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Sommaire" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Sommaire</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">déplacer vers la barre latérale</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">masquer</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Début</div> </a> </li> <li id="toc-Description" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Description"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Description</span> </div> </a> <ul id="toc-Description-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Préamplificateur_phono" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Préamplificateur_phono"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Préamplificateur phono</span> </div> </a> <button aria-controls="toc-Préamplificateur_phono-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Afficher / masquer la sous-section Préamplificateur phono</span> </button> <ul id="toc-Préamplificateur_phono-sublist" class="vector-toc-list"> <li id="toc-Correction_de_la_réponse_amplitude-fréquence" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Correction_de_la_réponse_amplitude-fréquence"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Correction de la réponse amplitude-fréquence</span> </div> </a> <ul id="toc-Correction_de_la_réponse_amplitude-fréquence-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Adaptation_de_l'impédance" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Adaptation_de_l'impédance"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2</span> <span>Adaptation de l'impédance</span> </div> </a> <ul id="toc-Adaptation_de_l'impédance-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Voir_aussi" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Voir_aussi"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Voir aussi</span> </div> </a> <ul id="toc-Voir_aussi-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Notes_et_références" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Notes_et_références"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Notes et références</span> </div> </a> <button aria-controls="toc-Notes_et_références-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Afficher / masquer la sous-section Notes et références</span> </button> <ul id="toc-Notes_et_références-sublist" class="vector-toc-list"> <li id="toc-Liens_externes" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Liens_externes"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1</span> <span>Liens externes</span> </div> </a> <ul id="toc-Liens_externes-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Sommaire" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Basculer la table des matières" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Basculer la table des matières</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Préamplificateur</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Aller à un article dans une autre langue. Disponible en 27 langues." > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-27" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">27 langues</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%85%D8%B6%D8%AE%D9%85_%D8%A3%D9%88%D9%84%D9%8A" title="مضخم أولي – arabe" lang="ar" hreflang="ar" data-title="مضخم أولي" data-language-autonym="العربية" data-language-local-name="arabe" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%9F%D1%80%D0%B5%D0%B4%D1%83%D1%81%D0%B8%D0%BB%D0%B2%D0%B0%D1%82%D0%B5%D0%BB" title="Предусилвател – bulgare" lang="bg" hreflang="bg" data-title="Предусилвател" data-language-autonym="Български" data-language-local-name="bulgare" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Preamplificador" title="Preamplificador – catalan" lang="ca" hreflang="ca" data-title="Preamplificador" data-language-autonym="Català" data-language-local-name="catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/P%C5%99edzesilova%C4%8D" title="Předzesilovač – tchèque" lang="cs" hreflang="cs" data-title="Předzesilovač" data-language-autonym="Čeština" data-language-local-name="tchèque" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Forforst%C3%A6rker" title="Forforstærker – danois" lang="da" hreflang="da" data-title="Forforstærker" data-language-autonym="Dansk" data-language-local-name="danois" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Vorverst%C3%A4rker" title="Vorverstärker – allemand" lang="de" hreflang="de" data-title="Vorverstärker" data-language-autonym="Deutsch" data-language-local-name="allemand" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Preamplifier" title="Preamplifier – anglais" lang="en" hreflang="en" data-title="Preamplifier" data-language-autonym="English" data-language-local-name="anglais" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Preamplificador" title="Preamplificador – espagnol" lang="es" hreflang="es" data-title="Preamplificador" data-language-autonym="Español" data-language-local-name="espagnol" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Aurreanplifikadore" title="Aurreanplifikadore – basque" lang="eu" hreflang="eu" data-title="Aurreanplifikadore" data-language-autonym="Euskara" data-language-local-name="basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%BE%DB%8C%D8%B4%E2%80%8C%D8%AA%D9%82%D9%88%DB%8C%D8%AA%E2%80%8C%DA%A9%D9%86%D9%86%D8%AF%D9%87" title="پیش‌تقویت‌کننده – persan" lang="fa" hreflang="fa" data-title="پیش‌تقویت‌کننده" data-language-autonym="فارسی" data-language-local-name="persan" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Esivahvistin" title="Esivahvistin – finnois" lang="fi" hreflang="fi" data-title="Esivahvistin" data-language-autonym="Suomi" data-language-local-name="finnois" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%A7%D7%93%D7%9D-%D7%9E%D7%92%D7%91%D7%A8" title="קדם-מגבר – hébreu" lang="he" hreflang="he" data-title="קדם-מגבר" data-language-autonym="עברית" data-language-local-name="hébreu" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Niskofrekventno_pretpoja%C4%8Dalo" title="Niskofrekventno pretpojačalo – croate" lang="hr" hreflang="hr" data-title="Niskofrekventno pretpojačalo" data-language-autonym="Hrvatski" data-language-local-name="croate" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Preamplificatore" title="Preamplificatore – italien" lang="it" hreflang="it" data-title="Preamplificatore" data-language-autonym="Italiano" data-language-local-name="italien" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%83%97%E3%83%AA%E3%82%A2%E3%83%B3%E3%83%97" title="プリアンプ – japonais" lang="ja" hreflang="ja" data-title="プリアンプ" data-language-autonym="日本語" data-language-local-name="japonais" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%ED%94%84%EB%A6%AC_%EC%95%B0%ED%94%84" title="프리 앰프 – coréen" lang="ko" hreflang="ko" data-title="프리 앰프" data-language-autonym="한국어" data-language-local-name="coréen" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Voorversterker" title="Voorversterker – néerlandais" lang="nl" hreflang="nl" data-title="Voorversterker" data-language-autonym="Nederlands" data-language-local-name="néerlandais" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Forforsterker" title="Forforsterker – norvégien bokmål" lang="nb" hreflang="nb" data-title="Forforsterker" data-language-autonym="Norsk bokmål" data-language-local-name="norvégien bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Przedwzmacniacz" title="Przedwzmacniacz – polonais" lang="pl" hreflang="pl" data-title="Przedwzmacniacz" data-language-autonym="Polski" data-language-local-name="polonais" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Pr%C3%A9-amplificador" title="Pré-amplificador – portugais" lang="pt" hreflang="pt" data-title="Pré-amplificador" data-language-autonym="Português" data-language-local-name="portugais" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9F%D1%80%D0%B5%D0%B4%D1%83%D1%81%D0%B8%D0%BB%D0%B8%D1%82%D0%B5%D0%BB%D1%8C" title="Предусилитель – russe" lang="ru" hreflang="ru" data-title="Предусилитель" data-language-autonym="Русский" data-language-local-name="russe" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Preamplifier" title="Preamplifier – Simple English" lang="en-simple" hreflang="en-simple" data-title="Preamplifier" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Predzosil%C5%88ova%C4%8D" title="Predzosilňovač – slovaque" lang="sk" hreflang="sk" data-title="Predzosilňovač" data-language-autonym="Slovenčina" data-language-local-name="slovaque" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/F%C3%B6rf%C3%B6rst%C3%A4rkare" title="Förförstärkare – suédois" lang="sv" hreflang="sv" data-title="Förförstärkare" data-language-autonym="Svenska" data-language-local-name="suédois" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Pre_amplifikat%C3%B6r" title="Pre amplifikatör – turc" lang="tr" hreflang="tr" data-title="Pre amplifikatör" data-language-autonym="Türkçe" data-language-local-name="turc" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9F%D0%BE%D0%BF%D0%B5%D1%80%D0%B5%D0%B4%D0%BD%D1%96%D0%B9_%D0%BF%D1%96%D0%B4%D1%81%D0%B8%D0%BB%D1%8E%D0%B2%D0%B0%D1%87" title="Попередній підсилювач – ukrainien" lang="uk" hreflang="uk" data-title="Попередній підсилювач" data-language-autonym="Українська" data-language-local-name="ukrainien" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Ti%E1%BB%81n_khu%E1%BA%BFch_%C4%91%E1%BA%A1i" title="Tiền khuếch đại – vietnamien" lang="vi" hreflang="vi" data-title="Tiền khuếch đại" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamien" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q399804#sitelinks-wikipedia" title="Modifier les liens interlangues" class="wbc-editpage">Modifier les liens</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Espaces de noms"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Pr%C3%A9amplificateur" title="Voir le contenu de la page [c]" accesskey="c"><span>Article</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Discussion:Pr%C3%A9amplificateur" rel="discussion" title="Discussion au sujet de cette page de contenu [t]" accesskey="t"><span>Discussion</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Modifier la variante de langue" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">français</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="Affichages"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Pr%C3%A9amplificateur"><span>Lire</span></a></li><li id="ca-ve-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Pr%C3%A9amplificateur&veaction=edit" title="Modifier cette page [v]" accesskey="v"><span>Modifier</span></a></li><li id="ca-edit" class="collapsible vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Pr%C3%A9amplificateur&action=edit" title="Modifier le wikicode de cette page [e]" accesskey="e"><span>Modifier le code</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Pr%C3%A9amplificateur&action=history" title="Historique des versions de cette page [h]" accesskey="h"><span>Voir l’historique</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Outils de la page"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="Outils" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Outils</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Outils</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">déplacer vers la barre latérale</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">masquer</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="Plus d’options" > <div class="vector-menu-heading"> Actions </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected 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class="mw-list-item"><a href="/wiki/Sp%C3%A9cial:Pages_li%C3%A9es/Pr%C3%A9amplificateur" title="Liste des pages liées qui pointent sur celle-ci [j]" accesskey="j"><span>Pages liées</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Sp%C3%A9cial:Suivi_des_liens/Pr%C3%A9amplificateur" rel="nofollow" title="Liste des modifications récentes des pages appelées par celle-ci [k]" accesskey="k"><span>Suivi des pages liées</span></a></li><li id="t-upload" class="mw-list-item"><a href="/wiki/Aide:Importer_un_fichier" title="Téléverser des fichiers [u]" accesskey="u"><span>Téléverser un fichier</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Sp%C3%A9cial:Pages_sp%C3%A9ciales" title="Liste de toutes les pages spéciales [q]" accesskey="q"><span>Pages spéciales</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=Pr%C3%A9amplificateur&oldid=216812658" title="Adresse permanente de cette version de cette 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class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Apparence</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">déplacer vers la barre latérale</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">masquer</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Un article de Wikipédia, l'encyclopédie libre.</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="fr" dir="ltr"><figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/Fichier:Musicfirstaudioclassicpreamplifier.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/35/Musicfirstaudioclassicpreamplifier.jpg/220px-Musicfirstaudioclassicpreamplifier.jpg" decoding="async" width="220" height="167" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/35/Musicfirstaudioclassicpreamplifier.jpg/330px-Musicfirstaudioclassicpreamplifier.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/35/Musicfirstaudioclassicpreamplifier.jpg/440px-Musicfirstaudioclassicpreamplifier.jpg 2x" data-file-width="1910" data-file-height="1453" /></a><figcaption>Un préamplificateur <a href="/wiki/Son_st%C3%A9r%C3%A9ophonique" title="Son stéréophonique">stéréo</a> <a href="/wiki/Haut_de_gamme" title="Haut de gamme">haut de gamme</a> typique.</figcaption></figure> <p>Un <b>préamplificateur</b>, <b>préampli</b><sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite_crochet">[</span>1<span class="cite_crochet">]</span></a></sup> ou <b>préamplificateur de commande</b><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite_crochet">[</span>2<span class="cite_crochet">]</span></a></sup> est un <a href="/wiki/Amplificateur_%C3%A9lectronique" title="Amplificateur électronique">amplificateur électronique</a> qui <i>reçoit</i> et <i>adapte</i> un <a href="/wiki/Signal_%C3%A9lectrique" title="Signal électrique">signal</a> avant de le transmettre à l'amplificateur principal. </p><p>Les faibles <a href="/wiki/Signal_%C3%A9lectrique" title="Signal électrique">signaux</a> sont très sensibles au <a href="/wiki/Bruit_(%C3%A9lectronique)" class="mw-redirect" title="Bruit (électronique)">bruit</a> (bruits de fond). Un préamplificateur de faible qualité entraînera donc une chute significative du <a href="/wiki/Rapport_signal-bruit" class="mw-redirect" title="Rapport signal-bruit">rapport signal-bruit</a>, en d'autres termes une baisse de la qualité du signal. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Description">Description</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Pr%C3%A9amplificateur&veaction=edit&section=1" title="Modifier la section : Description" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Pr%C3%A9amplificateur&action=edit&section=1" title="Modifier le code source de la section : Description"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Un préamplificateur joue le rôle de premier étage d'amplification situé au plus près de la source de signal. Conformément au <a href="/wiki/Facteur_de_bruit" title="Facteur de bruit">théorème de Friis</a>, c'est lui qui est le garant d'un bon <a href="/wiki/Rapport_signal_sur_bruit" title="Rapport signal sur bruit">rapport signal sur bruit</a> en sortie du système puisqu'il doit réussir à extraire un très faible signal électrique. Grâce à sa proximité à la source du signal, il permet de limiter les dégradations de celui-ci par des interférences parasites ou par son atténuation lors du transport. </p><p>Les préamplificateurs se rencontrent donc dans toutes les applications où l'on désire mesurer électriquement un signal physique en aval d'un <a href="/wiki/Transducteur" title="Transducteur">transducteur</a> quelconque : </p> <ul><li>applications <a href="/wiki/Audio" class="mw-disambig" title="Audio">audio</a> : <a href="/wiki/Microphone" title="Microphone">microphones</a>, <a href="/wiki/Platine_tourne-disques" title="Platine tourne-disques">tourne-disques</a>,</li> <li>applications <a href="/wiki/Radiofr%C3%A9quence" class="mw-redirect" title="Radiofréquence">radiofréquences</a> : <a href="/wiki/Antenne_radio%C3%A9lectrique" title="Antenne radioélectrique">antennes</a>,</li> <li>autres applications : <a href="/wiki/Photod%C3%A9tecteur" title="Photodétecteur">photodétecteurs</a>, détecteurs <a href="/wiki/Infrarouge" title="Infrarouge">infrarouge</a>, <a href="/wiki/Instruments_scientifiques" class="mw-redirect" title="Instruments scientifiques">instruments scientifiques</a>, etc.</li></ul> <p>En plus de la fonction d'<a href="/wiki/Amplificateur_faible_bruit" title="Amplificateur faible bruit">amplification bas bruit</a>, le préamplificateur peut incorporer des fonctions de <a href="/wiki/Traitement_du_signal" title="Traitement du signal">traitement de signal</a> simple : filtrage fréquentiel, correction de tonalité ou <a href="/wiki/Compresseur_(audio)" title="Compresseur (audio)">compression</a> par exemple. </p> <div class="mw-heading mw-heading2"><h2 id="Préamplificateur_phono"><span id="Pr.C3.A9amplificateur_phono"></span>Préamplificateur phono</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Pr%C3%A9amplificateur&veaction=edit&section=2" title="Modifier la section : Préamplificateur phono" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Pr%C3%A9amplificateur&action=edit&section=2" title="Modifier le code source de la section : Préamplificateur phono"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Lorsqu'utilisés avec une <a href="/wiki/Cha%C3%AEne_haute-fid%C3%A9lit%C3%A9" title="Chaîne haute-fidélité">chaîne haute-fidélité</a>, les <a href="/wiki/Tourne-disque" class="mw-redirect" title="Tourne-disque">tourne-disques</a> <a href="/wiki/%C3%89lectro-acoustique" class="mw-redirect" title="Électro-acoustique">électro-acoustiques</a> nécessitent un préamplificateur phono (aussi appelé préamplificateur RIAA), incorporé ou non, afin d'amplifier le signal audio, de corriger sa <a href="/wiki/R%C3%A9ponse_en_fr%C3%A9quence" title="Réponse en fréquence">réponse amplitude-fréquence</a> et de fixer l'<a href="/wiki/Imp%C3%A9dance_(%C3%A9lectricit%C3%A9)" title="Impédance (électricité)">impédance</a> d'entrée. </p> <div class="mw-heading mw-heading3"><h3 id="Correction_de_la_réponse_amplitude-fréquence"><span id="Correction_de_la_r.C3.A9ponse_amplitude-fr.C3.A9quence"></span>Correction de la réponse amplitude-fréquence</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Pr%C3%A9amplificateur&veaction=edit&section=3" title="Modifier la section : Correction de la réponse amplitude-fréquence" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Pr%C3%A9amplificateur&action=edit&section=3" title="Modifier le code source de la section : Correction de la réponse amplitude-fréquence"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="bandeau-container bandeau-section metadata bandeau-niveau-information"><div class="bandeau-cell bandeau-icone-css loupe">Article détaillé : <a href="/wiki/%C3%89galisation_RIAA" title="Égalisation RIAA">Égalisation RIAA</a>.</div></div> <p>Tous les disques vinyles sont enregistrés avec une même déformation de la courbe de réponse en fréquence (certaines fréquences sont amplifiées, d'autres atténuées). Cette courbe a été fixée par le <a href="/wiki/Recording_Industry_Association_of_America" title="Recording Industry Association of America">RIAA</a>, association responsable de la création des disques microsillons, afin de permettre un meilleur rendu sonore. Le préamplificateur phono doit donc appliquer une courbe de correction inverse sur le signal pour restituer le son correctement. </p> <div class="mw-heading mw-heading3"><h3 id="Adaptation_de_l'impédance"><span id="Adaptation_de_l.27imp.C3.A9dance"></span>Adaptation de l'impédance</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Pr%C3%A9amplificateur&veaction=edit&section=4" title="Modifier la section : Adaptation de l'impédance" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Pr%C3%A9amplificateur&action=edit&section=4" title="Modifier le code source de la section : Adaptation de l'impédance"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Le préamplificateur phono doit avoir, en entrée, la bonne valeur d'impédance et de capacité de charge nécessaires au bon fonctionnement de la <a href="/wiki/Cellule_magn%C3%A9tique" title="Cellule magnétique">tête de lecture</a>. La plupart des modèles ont 47 <abbr class="abbr" title="kiloohm">kΩ</abbr> d'impédance, mais la valeur peut varier selon les marques. </p> <div class="mw-heading mw-heading2"><h2 id="Voir_aussi">Voir aussi</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Pr%C3%A9amplificateur&veaction=edit&section=5" title="Modifier la section : Voir aussi" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Pr%C3%A9amplificateur&action=edit&section=5" title="Modifier le code source de la section : Voir aussi"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Amplificateur" class="mw-disambig" title="Amplificateur">Amplificateur</a></li> <li><a href="/wiki/Amplificateur_%C3%A9lectronique" title="Amplificateur électronique">Amplificateur électronique</a></li> <li><a href="/wiki/Amplificateur_audio" title="Amplificateur audio">Amplificateur audio</a></li> <li><a href="/wiki/Amplificateur_faible_bruit" title="Amplificateur faible bruit">Amplificateur faible bruit</a></li> <li><a href="/wiki/Amplificateur_de_mesure" title="Amplificateur de mesure">Amplificateur de mesure</a></li> <li><a href="/wiki/Pr%C3%A9amplificateur_d%27antenne" title="Préamplificateur d'antenne">Préamplificateur d'antenne</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Notes_et_références"><span id="Notes_et_r.C3.A9f.C3.A9rences"></span>Notes et références</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Pr%C3%A9amplificateur&veaction=edit&section=6" title="Modifier la section : Notes et références" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Pr%C3%A9amplificateur&action=edit&section=6" title="Modifier le code source de la section : Notes et références"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="references-small decimal" style=""><div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink noprint"><a href="#cite_ref-1">↑</a> </span><span class="reference-text">Selon le dictionnaire du <a href="/wiki/Antidote_(logiciel)" title="Antidote (logiciel)">logiciel Antidote RX</a>, cette <a href="/wiki/Apocope" title="Apocope">apocope</a> appartient au <a href="/wiki/Registre_de_langue" title="Registre de langue">registre de langue</a> familier (<a href="/wiki/2008" title="2008">2008</a>)</span> </li> <li id="cite_note-2"><span class="mw-cite-backlink noprint"><a href="#cite_ref-2">↑</a> </span><span class="reference-text">Ce terme est attesté dans le <a href="/wiki/Grand_dictionnaire_terminologique" class="mw-redirect" title="Grand dictionnaire terminologique">Grand dictionnaire terminologique</a> de l'<a href="/wiki/Office_qu%C3%A9b%C3%A9cois_de_la_langue_fran%C3%A7aise" title="Office québécois de la langue française">Office québécois de la langue française</a> (<a href="/wiki/1987" title="1987">1987</a>)</span> </li> </ol></div> </div> <div class="mw-heading mw-heading3"><h3 id="Liens_externes">Liens externes</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Pr%C3%A9amplificateur&veaction=edit&section=7" title="Modifier la section : Liens externes" class="mw-editsection-visualeditor"><span>modifier</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Pr%C3%A9amplificateur&action=edit&section=7" title="Modifier le code source de la section : Liens externes"><span>modifier le code</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><span class="ouvrage" id="Anzai_et_Jean_Hiraga"><span class="ouvrage" id="L_Anzai_et_Jean_Hiraga">L Anzai et Jean Hiraga, « <a rel="nofollow" class="external text" href="http://www.pure-hifi.info/pdf/Le%20magazine%20audiophile%20-Le%20pr%c3%a9amplificateur%20SRPP%20%c3%a0%20%c3%a9galiseur%20passif.pdf"><cite style="font-style:normal;">Préamplificateur passif de type SRPP</cite></a> », sur <span class="italique">pure-hifi.info</span></span></span>, facsimile d'un article de la revue <i>Audiophile</i> n°..7, novembre 1978.</li></ul> <ul id="bandeau-portail" class="bandeau-portail"><li><span class="bandeau-portail-element"><span class="bandeau-portail-icone"><span class="noviewer skin-invert-image" typeof="mw:File"><a href="/wiki/Portail:%C3%89lectricit%C3%A9_et_%C3%A9lectronique" title="Portail de l’électricité et de l’électronique"><img alt="icône décorative" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ea/Octicons-circuit-board.svg/24px-Octicons-circuit-board.svg.png" decoding="async" width="24" height="24" class="mw-file-element" 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