{"id":2378,"date":"2023-12-01T13:11:50","date_gmt":"2023-12-01T12:11:50","guid":{"rendered":"https:\/\/www.speich.net\/articles\/?p=2378"},"modified":"2025-10-10T16:58:34","modified_gmt":"2025-10-10T14:58:34","slug":"kef-lsx-ii-usb-audio-iec958-not-loud-enough","status":"publish","type":"post","link":"https:\/\/www.speich.net\/articles\/en\/2023\/12\/01\/kef-lsx-ii-usb-audio-iec958-not-loud-enough\/","title":{"rendered":"KEF LSX II on Linux: USB audio (IEC958) not loud enough"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">If the KEF LSX II speakers are connected to your Linux (Mint) PC via Digital Output (USB audio) instead of WiFi and the audio volume is not loud enough, it might be, that the gain of the internal sound card of the LSX II is set too low:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"858\" height=\"1024\" src=\"https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-1-858x1024.png\" alt=\"\" class=\"wp-image-2383\" style=\"width:400px\" srcset=\"https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-1-858x1024.png 858w, https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-1-251x300.png 251w, https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-1.png 1220w\" sizes=\"auto, (max-width: 858px) 100vw, 858px\" \/><figcaption class=\"wp-element-caption\">Screenshot showing the internal sound card of the LSX II speaker set to only 25%.<\/figcaption><\/figure>\n\n\n\n<!--more-->\n\n\n\n<p class=\"wp-block-paragraph\">To fix this, open <strong>alsamixer<\/strong> in the terminal: <code>$ alsamixer<\/code><\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"665\" src=\"https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/11\/image-1-1024x665.png\" alt=\"\" class=\"wp-image-2380\" style=\"width:650px\" srcset=\"https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/11\/image-1-1024x665.png 1024w, https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/11\/image-1-300x195.png 300w, https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/11\/image-1-1536x998.png 1536w, https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/11\/image-1-2048x1331.png 2048w, https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/11\/image-1-1568x1019.png 1568w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Screenshot showing the AlsaMixer in the terminal.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Then press <strong>F6<\/strong> to select the sound card of the LSX II and increase the PCM volume to 100% with the <strong>arrow up key<\/strong>:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"858\" height=\"1024\" src=\"https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-2-858x1024.png\" alt=\"\" class=\"wp-image-2384\" style=\"width:400px\" srcset=\"https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-2-858x1024.png 858w, https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-2-251x300.png 251w, https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-2.png 1220w\" sizes=\"auto, (max-width: 858px) 100vw, 858px\" \/><figcaption class=\"wp-element-caption\">Screenshot showing the internal sound card of the LSX II speaker set to 100%.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Then save the settings permanently with:<\/p>\n\n\n\n<pre class=\"wp-block-code language-bash\"><code>$ sudo alsactl store<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">If your alsamixer settings get lost after the next reboot, this article about an alternative way of storing alsa settings permanently might help: <a href=\"https:\/\/ubuntu-mate.community\/t\/storing-alsamixer-settings\/16953\" target=\"_blank\" rel=\"noreferrer noopener\">Storing Alsamixer Settings<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Also check that the volume in the <strong>KEF Connect app<\/strong> under <strong>Remote<\/strong> is also set to 100%:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"595\" height=\"1024\" src=\"https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-3-595x1024.png\" alt=\"\" class=\"wp-image-2385\" style=\"width:400px\" srcset=\"https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-3-595x1024.png 595w, https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-3-174x300.png 174w, https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-3-893x1536.png 893w, https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-3-1191x2048.png 1191w, https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-3.png 1200w\" sizes=\"auto, (max-width: 595px) 100vw, 595px\" \/><figcaption class=\"wp-element-caption\">Screenshot of the KEF Connect app with volume control set to 100%.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Now, you can regulate the volume in the Linux Mint <strong>Sound<\/strong> settings&#8230;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"861\" height=\"1024\" src=\"https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-861x1024.png\" alt=\"\" class=\"wp-image-2382\" style=\"width:650px\" srcset=\"https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-861x1024.png 861w, https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-252x300.png 252w, https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-1292x1536.png 1292w, https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image.png 1516w\" sizes=\"auto, (max-width: 861px) 100vw, 861px\" \/><figcaption class=\"wp-element-caption\">Screenshot of the Linux Mint sound settings, where the audio output is set to Digital Output (S\/PDIF) LSX II<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">&#8230;or directly on the keyboard with the media keys. If your keyboard only has volume -\/+ and play\/pause buttons such as the Microsoft Natural Ergonomic Keyboard, but no previous\/next track buttons, create two new keyboard shortcuts in the Linux Mint <strong>Keyboard<\/strong> settings:<\/p>\n\n\n\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;6a1f3df1bd416&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"6a1f3df1bd416\" class=\"wp-block-image size-large is-resized wp-lightbox-container\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1014\" data-wp-class--hide=\"state.isContentHidden\" data-wp-class--show=\"state.isContentVisible\" data-wp-init=\"callbacks.setButtonStyles\" data-wp-on--click=\"actions.showLightbox\" data-wp-on--load=\"callbacks.setButtonStyles\" data-wp-on--pointerdown=\"actions.preloadImage\" data-wp-on--pointerenter=\"actions.preloadImageWithDelay\" data-wp-on--pointerleave=\"actions.cancelPreload\" data-wp-on-window--resize=\"callbacks.setButtonStyles\" src=\"https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-4-1024x1014.png\" alt=\"\" class=\"wp-image-2392\" style=\"width:650px\" srcset=\"https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-4-1024x1014.png 1024w, https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-4-300x297.png 300w, https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-4-150x150.png 150w, https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-4-1536x1521.png 1536w, https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-4-1568x1553.png 1568w, https:\/\/www.speich.net\/wp\/wp-content\/uploads\/2023\/12\/image-4.png 1660w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><button\n\t\t\tclass=\"lightbox-trigger\"\n\t\t\ttype=\"button\"\n\t\t\taria-haspopup=\"dialog\"\n\t\t\tdata-wp-bind--aria-label=\"state.thisImage.triggerButtonAriaLabel\"\n\t\t\tdata-wp-init=\"callbacks.initTriggerButton\"\n\t\t\tdata-wp-on--click=\"actions.showLightbox\"\n\t\t\tdata-wp-style--right=\"state.thisImage.buttonRight\"\n\t\t\tdata-wp-style--top=\"state.thisImage.buttonTop\"\n\t\t>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" fill=\"none\" viewBox=\"0 0 12 12\">\n\t\t\t\t<path fill=\"#fff\" d=\"M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z\" \/>\n\t\t\t<\/svg>\n\t\t<\/button><figcaption class=\"wp-element-caption\">Screenshot of the Linux Mint Keyboard settings, where the Launch9 key (= My Favorites 5 key on the Microsoft Natural Keyboard 4000) is assigned to Next track.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">This way, you can completely control the Wireless Hifi Speakers KEF LSX II with the keyboard (when playing music from Spotify).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Linux rocks !!!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Undocumented: You can access your speakers directly in the browser with the speaker&#8217;s IP address, e.g.: https:\/\/192.168.1.72\/<strong>index.fcgi<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>If the KEF LSX II speakers are connected to your Linux (Mint) PC via Digital Output (USB audio) instead of WiFi and the audio volume is not loud enough, it might be, that the gain of the internal sound card of the LSX II is set too low:<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[315],"tags":[355,54],"class_list":["post-2378","post","type-post","status-publish","format-standard","hentry","category-linux","tag-kef-lsx-ii","tag-linux-mint","entry"],"_links":{"self":[{"href":"https:\/\/www.speich.net\/articles\/wp-json\/wp\/v2\/posts\/2378","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.speich.net\/articles\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.speich.net\/articles\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.speich.net\/articles\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.speich.net\/articles\/wp-json\/wp\/v2\/comments?post=2378"}],"version-history":[{"count":13,"href":"https:\/\/www.speich.net\/articles\/wp-json\/wp\/v2\/posts\/2378\/revisions"}],"predecessor-version":[{"id":2674,"href":"https:\/\/www.speich.net\/articles\/wp-json\/wp\/v2\/posts\/2378\/revisions\/2674"}],"wp:attachment":[{"href":"https:\/\/www.speich.net\/articles\/wp-json\/wp\/v2\/media?parent=2378"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.speich.net\/articles\/wp-json\/wp\/v2\/categories?post=2378"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.speich.net\/articles\/wp-json\/wp\/v2\/tags?post=2378"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}