{"id":144157,"date":"2022-04-17T16:05:14","date_gmt":"2022-04-17T15:05:14","guid":{"rendered":"https:\/\/www.techweekmag.com\/?p=144157"},"modified":"2024-03-17T18:00:25","modified_gmt":"2024-03-17T18:00:25","slug":"boulder-812-versatile-preamp-dac-and-headphone-amp","status":"publish","type":"post","link":"https:\/\/www.stereoindex.com\/tech\/hi-fi\/boulder-812-versatile-preamp-dac-and-headphone-amp\/","title":{"rendered":"Boulder 812: Versatile preamp, DAC and headphone amp"},"content":{"rendered":"<p>The American company\u00a0<b>Boulder<\/b>\u00a0has officially announced the start of sales of a new model with the index\u00a0<b>812<\/b>\u00a0, which is a combination of pre-amplifier, headphone amplifier and DAC.<\/p>\n<p>The device can be used as part of a complete system, or as a separate component.\u00a0The D\/A converter circuitry is inherited from the\u00a0<b>Boulder 866<\/b>\u00a0, and the preamplifier section has a fully symmetrical configuration.\u00a0The headphone amplifier is equipped with four connectors for connecting headphones &#8211;\u00a0<b>6.35 mm<\/b>\u00a0,\u00a0<b>3.5 mm<\/b>\u00a0, four-pin\u00a0<b>XLR<\/b>\u00a0and\u00a0<b>Pentacon<\/b>\u00a0.<\/p>\n<figure id=\"attachment_144158\" aria-describedby=\"caption-attachment-144158\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-144158 size-full\" src=\"https:\/\/www.stereoindex.com\/tech\/wp-content\/uploads\/2022\/04\/Boulder-812.jpg\" alt=\"Boulder 812\" width=\"650\" height=\"433\" srcset=\"https:\/\/www.stereoindex.com\/tech\/wp-content\/uploads\/2022\/04\/Boulder-812.jpg 650w, https:\/\/www.stereoindex.com\/tech\/wp-content\/uploads\/2022\/04\/Boulder-812-480x320.jpg 480w\" sizes=\"auto, (max-width: 650px) 100vw, 650px\" \/><figcaption id=\"caption-attachment-144158\" class=\"wp-caption-text\">Boulder 812<\/figcaption><\/figure>\n<p>Sensitivity adjustment for matching with headphones is done through the\u00a0<b>Boulder Controller<\/b>\u00a0proprietary application , the amplifier power is\u00a0<b>200 mV<\/b>\u00a0at 8 ohms and\u00a0<b>80 mV<\/b>\u00a0at 600 ohms.\u00a0The weight of the device is\u00a0<b>6.35 kilograms<\/b>\u00a0.<\/p>\n<figure id=\"attachment_144159\" aria-describedby=\"caption-attachment-144159\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-144159\" src=\"https:\/\/www.stereoindex.com\/tech\/wp-content\/uploads\/2022\/04\/Boulder-812-1.jpg\" alt=\"Boulder 812\" width=\"650\" height=\"433\" srcset=\"https:\/\/www.stereoindex.com\/tech\/wp-content\/uploads\/2022\/04\/Boulder-812-1.jpg 650w, https:\/\/www.stereoindex.com\/tech\/wp-content\/uploads\/2022\/04\/Boulder-812-1-480x320.jpg 480w\" sizes=\"auto, (max-width: 650px) 100vw, 650px\" \/><figcaption id=\"caption-attachment-144159\" class=\"wp-caption-text\">Boulder 812<\/figcaption><\/figure>\n<p>Visit official Boulder website for more info.<\/p>\n<h3>Specifications:<\/h3>\n<ul class=\"specs-list\">\n<li class=\"spec-row clearfix\">\n<div class=\"spec-left\">\n<p><strong>CONNECTIONS (FRONT)<\/strong><\/p>\n<\/div>\n<div class=\"spec-right\">\n<p>\u20224-Pin XLR Headphone Connector<br \/>\n\u20221\/8\u201d Headphone Connector<br \/>\n\u20221\/4\u201d Headphone Connector<br \/>\n\u2022Pentacon Headphone Connector<\/p>\n<\/div>\n<\/li>\n<li class=\"spec-row clearfix\">\n<div class=\"spec-left\">\n<p><strong>CONNECTIONS (BACK)<\/strong><\/p>\n<\/div>\n<div class=\"spec-right\">\n<p>\u20222 Pair XLR Analog Inputs<br \/>\n\u20221 Pair XLR Preamplifier Output<br \/>\n\u20224x USB Host<br \/>\n\u2022Ethernet<br \/>\n\u2022USB-B<br \/>\n\u20222 Optical Digital Inputs<br \/>\n\u2022Coaxial (RCA, SPDIF) Digital Input<\/p>\n<\/div>\n<\/li>\n<li class=\"spec-row clearfix\">\n<div class=\"spec-left\">\n<p><strong>SOFTWARE FEATURES<\/strong><\/p>\n<\/div>\n<div class=\"spec-right\">\n<p>\u2022Based on 866 DSP Filter and DAC topology<br \/>\n\u2022Configurable Headphone Sensitivity<br \/>\n\u2022Available Fixed DAC out<br \/>\n\u2022HTML Programming<br \/>\n\u2022Control through Boulder Controller App<br \/>\n\u2022Input Trim<\/p>\n<\/div>\n<\/li>\n<li class=\"spec-row clearfix\">\n<div class=\"spec-left\">\n<p><strong>HARDWARE FEATURES<\/strong><\/p>\n<\/div>\n<div class=\"spec-right\">\n<p>\u2022Switch Between Headphone and Preamp Outputs<br \/>\n\u2022Volume Knob & Chassis Machined In House<br \/>\n\u2022100 db Optically Encoded Volume Control<br \/>\n\u2022Innovative Protection Circuits<\/p>\n<\/div>\n<\/li>\n<li class=\"spec-row clearfix\">\n<div class=\"spec-left\">\n<p><strong>DIMENSIONS<\/strong><\/p>\n<\/div>\n<div class=\"spec-right\">\n<p>12\u201dx12\u201dx 3.5\u201d<\/p>\n<\/div>\n<\/li>\n<li class=\"spec-row clearfix\">\n<div class=\"spec-left\">\n<p><strong>WEIGHT<\/strong><\/p>\n<\/div>\n<div class=\"spec-right\">\n<p>14 lbs<\/p>\n<\/div>\n<\/li>\n<\/ul>\n<!-- FeedbackWP Plugin --><div        class=\"rmp-widgets-container rmp-wp-plugin 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The device can be used as part of a complete system, or as a separate component.\u00a0The D\/A converter circuitry is inherited from the\u00a0Boulder 866\u00a0, and the preamplifier section has [&hellip;] <a class=\"g1-link g1-link-more\" href=\"https:\/\/www.stereoindex.com\/tech\/hi-fi\/boulder-812-versatile-preamp-dac-and-headphone-amp\/\">More<\/a><\/p>\n","protected":false},"author":10404,"featured_media":144160,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[642],"tags":[779],"adace-sponsor":[],"class_list":["post-144157","post","type-post","status-publish","format-standard","has-post-thumbnail","category-hi-fi","tag-news"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/posts\/144157","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/users\/10404"}],"replies":[{"embeddable":true,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/comments?post=144157"}],"version-history":[{"count":0,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/posts\/144157\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/media\/144160"}],"wp:attachment":[{"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/media?parent=144157"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/categories?post=144157"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/tags?post=144157"},{"taxonomy":"adace-sponsor","embeddable":true,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/adace-sponsor?post=144157"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}