{"id":6931,"date":"2021-04-05T22:11:34","date_gmt":"2021-04-05T20:11:34","guid":{"rendered":"https:\/\/www.loudspeakers.audio\/?post_type=ufaq&#038;p=6931"},"modified":"2021-04-13T09:19:39","modified_gmt":"2021-04-13T07:19:39","slug":"correction-at-mid-and-high-frequencies","status":"publish","type":"ufaq","link":"https:\/\/www.loudspeakers.audio\/fr\/faqs\/correction-at-mid-and-high-frequencies\/","title":{"rendered":"Correction aux fr\u00e9quences moyennes et hautes ?"},"content":{"rendered":"<style>.ewd-ufaq-post-margin-symbol { color: #4055a9 !important; }.ewd-ufaq-post-margin-symbol { border-color: #53037d !important; }.ewd-ufaq-faq-display-style-block.ewd-ufaq-post-active, .ewd-ufaq-faq-display-style-block.ewd-ufaq-post-active a,.ewd-ufaq-faq-display-style-block:hover, .ewd-ufaq-faq-display-style-block:hover a, .ewd-ufaq-faq-display-style-block:hover h5 { background-color: #617ffe !important; }.ewd-ufaq-faq-display-style-border_block.ewd-ufaq-post-active, .ewd-ufaq-faq-display-style-border_block:hover, .ewd-ufaq-faq-display-style-border_block:hover h5 { background-color: #617ffe !important; 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}<\/style><div  class=\"ewd-ufaq-faq-list ewd-ufaq-page-type-infinite_scroll ewd-ufaq-category-tabs-\" id='ewd-ufaq-faq-list'>\n\n\t<input type='hidden' name='show_on_load' value='' id='ewd-ufaq-show-on-load' \/>\n<input type='hidden' name='include_category' value='' id='ewd-ufaq-include-category' \/>\n<input type='hidden' name='exclude_category' value='' id='ewd-ufaq-exclude-category' \/>\n<input type='hidden' name='orderby' value='set_order' id='ewd-ufaq-orderby' \/>\n<input type='hidden' name='order' value='asc' id='ewd-ufaq-order' \/>\n<input type='hidden' name='post_count' value='-1' id='ewd-ufaq-post-count' \/>\n<input type='hidden' name='current_url' value='\/fr\/wp-json\/wp\/v2\/ufaq\/6931' id='ewd-ufaq-current-url' \/>\n\t\n\t\n\t<div class='ewd-ufaq-faqs'>\n\n\t\t<div  class=\"ewd-ufaq-faq-div ewd-ufaq-faq-column-count-two ewd-ufaq-faq-responsive-columns-1 ewd-ufaq-faq-display-style-minimalist ewd-ufaq-can-be-toggled\" id='ewd-ufaq-post-6931-tw3SfQa1M4' data-post_id='6931'>\n\n\t\t\n\t<div class='ewd-ufaq-faq-title ewd-ufaq-faq-toggle'>\n\t\n\t<a class='ewd-ufaq-post-margin'  href='#' role=\"button\">\n\n\t\t<div class='ewd-ufaq-post-margin-symbol ewd-ufaq-square'>\n\t\t\t<span >B<\/span>\n\t\t<\/div>\n\n\t\t<div class='ewd-ufaq-faq-title-text'>\n\n\t\t\t<h5>\n\t\t\t\tCorrection aux fr\u00e9quences moyennes et hautes ?\t\t\t<\/h5>\n\n\t\t<\/div>\n\n\t\t<div class='ewd-ufaq-clear'><\/div>\n\n\t<\/a>\n\t\n<\/div>\n\t\n\t<div class='ewd-ufaq-faq-body' >\n\n\t\t\n\t\t\t\n\t\t\n\t\t\t\n\t\t\n\t\t\t<div class='ewd-ufaq-post-margin ewd-ufaq-faq-post'>\n\t<p>Cette question revient souvent quand on parle de correction :<br \/>\nS\u00e9parons les gammes :<br \/>\n- sous 200-300Hz, les modes de pi\u00e8ce sont toujours pr\u00e9sent (dans des salles de tailles habituelles) et il faut g\u00e9n\u00e9ralement amortir les pointes, sans trop combler les creux<br \/>\n- de 200 \u00e0 environ 500-800Hz, la position de l'enceinte par rapport aux murs, engendre creux et bosses, mais ces probl\u00e8mes acoustiques peuvent \u00eatre am\u00e9lior\u00e9s par une \u00e9galisation \u00e9lectronique (au dessus de ces fr\u00e9quences, l'influence des r\u00e9flexions est tr\u00e8s d\u00e9pendante de la position exacte d'\u00e9coute mais heureusement le syst\u00e8me auditif procure un lissage fr\u00e9quentiel)<br \/>\n- au-dessus de 600-700Hz, il faut corriger la r\u00e9ponse de l'enceinte si celle-ci n'est pas parfaite<br \/>\nUne m\u00e9thode est donc n\u00e9cessaire pour montrer (uniquement) les d\u00e9fauts qui doivent \u00eatre corrig\u00e9s (c'est pour \u00e7a que nous pr\u00e9conisons <a href=\"https:\/\/www.loudspeakers.audio\/fr\/faqs\/mmm-moving-mic-measurement\/\">la m\u00e9thode MMM)<\/a>).<br \/>\nIl faut savoir qu'une correction rat\u00e9e peut \u00eatre pire que pas de correction du tout : il est donc important de pouvoir \u00e9couter et comparer sans\/avec EQ (et niveaux exactement ajust\u00e9s).<\/p>\n<p>Voici une comparaison de 9 mesures MMM de la m\u00eame enceinte dans 9 pi\u00e8ces diff\u00e9rentes (1\u00e0 \u00e0 30m2, distance de 2 \u00e0 3m). Il est clair que :<br \/>\n- sous 300Hz, tout d\u00e9pend de la pi\u00e8ce<br \/>\n- entre 300 et 800Hz, la pi\u00e8ce et l'enceinte sont li\u00e9es<br \/>\n- au-dessus de 800Hz, c'est l'enceinte qui donne la r\u00e9ponse. Celle-ci est juste mod\u00e9r\u00e9e par la distance et l'absorption acoustique (cf les courbes PIR Predicted In-Room de Harman).<br \/>\n<img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full\" src=\"https:\/\/i21.servimg.com\/u\/f21\/11\/21\/77\/49\/align110.png\" width=\"800\" height=\"240\" \/><\/p>\n<p>Une autre comparaison: la m\u00eame enceinte dans un chambre sourde et deux pi\u00e8ces non trait\u00e9es acoustiquement (une pi\u00e8ce mesur\u00e9e 3 fois). Ici sont affich\u00e9es les seules diff\u00e9rences par rapport \u00e0 la mesure an\u00e9cho\u00efque \u00e0 0dB. Au-dessus de 600Hz, la diff\u00e9rence est inf\u00e9rieure \u00e0 2dB : MMM mesure la r\u00e9ponse de l'enceinte seule, pas la pi\u00e8ce.<br \/>\n<img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full\" src=\"https:\/\/i.servimg.com\/u\/f21\/11\/21\/77\/49\/mmm210.jpg\" width=\"800\" height=\"240\" \/><\/p>\n<\/div>\n\t\t\n\t\t\t<div class='ewd-ufaq-permalink'>\n\t\n\t<a href='https:\/\/www.loudspeakers.audio\/fr\/faqs\/correction-at-mid-and-high-frequencies\/single-faq\/correction-at-mid-and-high-frequencies\/'>\n\t\t\n\t\tPermalink\t\t\t\n\t<\/a>\n\n<\/div>\n\t\t\n\t\t\t\n\t\t\n\t\t\t\n\t\t\n\t\t\t<div class='ewd-ufaq-faq-custom-fields'>\n\n\t\n<\/div>\n\t\t\n\t\t\t\n\t\t\n\t\t\t\n\t\t\n\t\t\t\n\t\t\n\t<\/div>\n\n<\/div>\n\t<\/div>\n\n\t\n<\/div>","protected":false},"excerpt":{"rendered":"<p>B Correction at mid and high frequencies ? This question often comes when discussing electronic correction. Let&#8217;s separate things : &#8211; under 200 to 300Hz, room modes are allways present in any room (of normal size) and you generally have to smooth peaks, and avoid filling dips (don&#8217;t add energy &hellip;<\/p>","protected":false},"author":1,"featured_media":0,"template":"","ufaq-category":[186],"ufaq-tag":[],"class_list":["post-6931","ufaq","type-ufaq","status-publish","hentry","ufaq-category-6-acoustics-and-eq"],"_links":{"self":[{"href":"https:\/\/www.loudspeakers.audio\/fr\/wp-json\/wp\/v2\/ufaq\/6931","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.loudspeakers.audio\/fr\/wp-json\/wp\/v2\/ufaq"}],"about":[{"href":"https:\/\/www.loudspeakers.audio\/fr\/wp-json\/wp\/v2\/types\/ufaq"}],"author":[{"embeddable":true,"href":"https:\/\/www.loudspeakers.audio\/fr\/wp-json\/wp\/v2\/users\/1"}],"wp:attachment":[{"href":"https:\/\/www.loudspeakers.audio\/fr\/wp-json\/wp\/v2\/media?parent=6931"}],"wp:term":[{"taxonomy":"ufaq-category","embeddable":true,"href":"https:\/\/www.loudspeakers.audio\/fr\/wp-json\/wp\/v2\/ufaq-category?post=6931"},{"taxonomy":"ufaq-tag","embeddable":true,"href":"https:\/\/www.loudspeakers.audio\/fr\/wp-json\/wp\/v2\/ufaq-tag?post=6931"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}