{"product_id":"fosi-audio-tube-phono-preamp-box-x4","title":"Fosi Audio Tube Phono Preamp – BOX X4","description":"\u003ch2\u003eGive Your Turntable a Dedicated Place in Your Audio System\u003c\/h2\u003e\u003cp\u003eBring your MM turntable into a line-level audio setup with the Fosi Audio BOX X4 tube phono preamp. Its compact metal body, tone controls and headphone connection make it a useful centerpiece for a personal listening station.\u003c\/p\u003e\u003ch3\u003eKey Benefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMM phono stage\u003c\/strong\u003e — Convert a compatible turntable signal to line level.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBass and treble controls\u003c\/strong\u003e — Adjust the tonal balance from the front panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeadphone connection\u003c\/strong\u003e — Add another listening option to your desktop setup.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eMake your record-playing routine feel more intentional, from selecting an album to setting the listening level. Use the BOX X4 with powered speakers or an appropriate amplifier; it does not directly power passive speakers.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eCan it drive passive speakers directly?\u003c\/h3\u003e\u003cp\u003eNo. Passive speakers require a suitable amplifier.\u003c\/p\u003e\u003ch3\u003eWhich turntable cartridge type is specified?\u003c\/h3\u003e\u003cp\u003eThe phono input is specified for MM cartridges.\u003c\/p\u003e\u003ch3\u003eAre vacuum tubes fitted?\u003c\/h3\u003e\u003cp\u003eYes. The description identifies 6J1 vacuum tubes.\u003c\/p\u003e\u003ch3\u003eCan I adjust bass and treble on the unit?\u003c\/h3\u003e\u003cp\u003eYes. The front panel has separate bass and treble controls.\u003c\/p\u003e\u003ch3\u003eDoes it have a headphone connection?\u003c\/h3\u003e\u003cp\u003eYes. The product description and front panel identify a headphone connection.\u003c\/p\u003e\u003ch1\u003eSPECIFICATIONS\u003c\/h1\u003e\u003cp\u003e\u003cspan\u003eBrand Name\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eFosi Audio\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eCertification\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eCE\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eChannels\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e2 (2.0)\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eControl Method\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003ePush button\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eFOSI AUDIO Model\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eX4\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eHigh-concerned chemical\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003enone\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eInput\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eRCA+3.5mm AUX\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eMaterial\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eMetal\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eMaximum Power Per Channel\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eNO POWER\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eModel Number\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eBOX X4\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eOrigin\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eMainland China\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eOutput\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003ePowered Speakers\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eOutput Power\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e0\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003ePackage\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eYes\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003ePower Adapter\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e12V with UL PSE Level 6 energy efficiency\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eSurround sound channel configuration\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eOthers\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eType\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eTube Preamp Amplifier\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003efeature\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eDesktop Audio Preamp,MM Phono Stage Amplifier\u003c\/span\u003e\u003c\/p\u003e\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003ckse:widget data-widget-type=\"customText\" id=\"1005000000920131\" type=\"custom\"\u003e\u003c\/kse:widget\u003e\u003c\/div\u003e\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\n\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cdiv\u003e\n\u003cdiv\u003e\u003cdiv\u003e\n\u003cdiv\u003e\u003cdiv\u003e\u003cdiv\u003e\u003cdiv\u003e\u003cdiv\u003e\u003cdiv\u003e\n\u003cdiv\u003e\u003cimg width=\"944\" height=\"367\" src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S381fc8aafe5f4ef99c32765118353cd6r.jpg\" slate-data-type=\"image\"\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-size:24px\"\u003eFosi Audio Phono Preamp for Turntable Phonograph Preamplifier With Vacuum Tube Amplifier HiFi BOX X4\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"color:rgb(240, 10, 10);font-size:28px\"\u003e\u003cstrong\u003eNotice:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"color:rgb(240, 10, 10);font-size:26px\"\u003e\u003cstrong\u003e1.\u003c\/strong\u003e\u003c\/span\u003e\u003cstrong\u003e\u003cspan style=\"color:rgb(244, 78, 59);font-size:26px\"\u003eThe BOX X4 is currently equipped with a 6J1 vacuum tube.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"color:rgb(240, 10, 10);font-size:26px\"\u003e\u003cstrong\u003e2.BOX X4 is only a preamplifier, not amplifier, can not be connected with passive speakers directly, If you need connect BOX X3 with passive speakers, you need to connect it with an amplifier then connect the amplifier with your passive speakers.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-size:22px\"\u003eFeatures:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003e1. Tube MM Phono Preamplifier: The BOX X4 phono preamp supports 3.5MM AUX and MM turntable input, converting phono signals to Line Level with low-frequency noise removal using high-quality components and low-noise integrated circuits. Protect your turntable with the grounding post feature\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\u003cli\u003e\n\u003cdiv\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003e2.Tube Headphone Amplifier \u0026amp; Preamplifier: The Fosi Audio BOX X4's versatile design includes a 3.5MM AUX headphone and RCA output, offering a range of usability beyond expectations\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\u003cli\u003e\n\u003cdiv\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003e3.Applicable Vacuum Tube Model: 6K4\/6J1\/6J4\/GE5654\/6AK5\/66*In vacuum tubes, etc. Achieve a customized stereo system by replacing vacuum tubes. With different tubes producing unique sounds, it's a DIY opportunity worth exploring\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-size:22px\"\u003e\u003cbr\u003eHighlight:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eModel: BOX X4\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003ePower Adapter Output: 12V\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eProduct Adapter Input Voltage Range: AC 100V - 240V\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eOutput Voltage Level: 1kHz and 650mV\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eSNR ≥ 70dB\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eTHD ≤ 0.1%\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eFrequency Response: Standard RIAA\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eProduct Weight: 0.71 lb\/320g\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eProduct Dimensions: 3.97x4.72x1.37 inch (10.09*12*3.5 cm)\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eInput Mode: MM turntable input +3.5mm AUX\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eOutput Mode: RCA output + 3.5mm headphone output\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003eApplicable headphone types: 16 Ω - 300 Ω\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-size:22px\"\u003e\u003cstrong\u003e\u003cbr\u003ePackage Include:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cspan style=\"font-size:20px\"\u003e*Box X4 Phono Preamp x1\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-size:20px\"\u003e*\u003c\/span\u003e\u003c\/strong\u003e\u003cstrong\u003e\u003cspan style=\"color:rgb(244, 78, 59);font-size:20px\"\u003e6J1 Vacuum Tubes x2\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003e*12V Power Adaptor x1\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003e*User Manual x1\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cbr\u003e\u003cspan style=\"font-size:26px\"\u003e\u003cstrong\u003eQA\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003e\u003cstrong\u003eQ1:Can the headphone and RCA outputs be used simultaneously?\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eYes. When both the 3.5mm headphone output and RCA output are connected, sound will be output through both the headphones and RCA connectors.\u003c\/p\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cdiv\u003e\u003cdiv\u003e\u003cdiv\u003e\n\u003cp\u003e\u003cspan style=\"font-size:20px\"\u003e\u003cstrong\u003eQ2:Can the BOX X4 be used with an MC cartridge?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eNO.The BOX X4 is designed specifically for use with MM cartridges. However, our upcoming model, the BOX X5 is compatible with MC cartridges.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S9f691a7cdbbc4b70bc1afbca7a7c140fL.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cdiv\u003e\u003cdiv\u003e\u003cdiv\u003e\u003cp\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S64b3b1ecd8964a7ea7f65c12200cecd1K.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S525e67512994471db983efa8ada580c33.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sdbd661075964486bba0584c35686447dz.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sa2205908514a4b01880b179300edbfa0o.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sb3abcf52f7e74087aa7f3fb9d51a29afz.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/A752197d6a42f4bdc973f1acb8582c501c.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sa44c1204a9714972813a093af588a0d5e.jpg\" slate-data-type=\"image\"\u003e\u003c\/p\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003ckse:widget data-widget-type=\"customText\" id=\"1005000024963203\" type=\"custom\"\u003e\u003c\/kse:widget\u003e\u003c\/div\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Authority Asset Brand","offers":[{"title":"WITH POWER SUPPLY \/ Brazil","offer_id":68013432963316,"sku":"14:200001438#WITH POWER SUPPLY;200007763:203054829","price":100.99,"currency_code":"USD","in_stock":true},{"title":"WITH POWER SUPPLY \/ China Mainland","offer_id":68013432897780,"sku":"14:200001438#WITH POWER SUPPLY;200007763:201336100","price":116.99,"currency_code":"USD","in_stock":true},{"title":"WITH POWER SUPPLY \/ United States","offer_id":68013432930548,"sku":"14:200001438#WITH POWER SUPPLY;200007763:201336106","price":182.99,"currency_code":"USD","in_stock":false},{"title":"WITH POWER SUPPLY \/ Russian Federation","offer_id":68013432996084,"sku":"14:200001438#WITH POWER SUPPLY;200007763:201336103","price":163.99,"currency_code":"USD","in_stock":false},{"title":"WITH POWER SUPPLY \/ Italy","offer_id":68013433028852,"sku":"14:200001438#WITH POWER SUPPLY;200007763:201336343","price":182.99,"currency_code":"USD","in_stock":false},{"title":"WITH POWER SUPPLY \/ spain","offer_id":68013433061620,"sku":"14:200001438#WITH POWER SUPPLY;200007763:201336104","price":163.99,"currency_code":"USD","in_stock":false},{"title":"WITH POWER SUPPLY \/ Australia","offer_id":68013433094388,"sku":"14:200001438#WITH POWER SUPPLY;200007763:201336099","price":182.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0823\/0564\/6836\/files\/S99886e960182448296986cbd7b23a1cdK.webp?v=1793579499","url":"https:\/\/authorityassetbrand.com\/products\/fosi-audio-tube-phono-preamp-box-x4","provider":"Authority Asset Brand","version":"1.0","type":"link"}