{"product_id":"fosi-mc331","title":"Fosi Audio MC331","description":"\u003cp\u003eFosi Audio MC331 is a compact tube integrated amplifier combining digital and analog source selection, speaker amplification, headphone listening and preamplifier output.\u003c\/p\u003e\u003cp\u003eIts replaceable tubes, illuminated VU meter, remote control and 105W × 2 maximum output at 4Ω make it a flexible desktop or bookshelf-speaker hub.\u003c\/p\u003e\u003ch2\u003eWhy it stands out\u003c\/h2\u003e\u003ch3\u003eAll-in-one audio hub\u003c\/h3\u003e\u003cp\u003eCombines a DAC, integrated speaker amplifier, preamplifier and headphone amplifier in one compact chassis.\u003c\/p\u003e\u003ch3\u003eFive source inputs\u003c\/h3\u003e\u003cp\u003eAccepts Bluetooth, USB, optical, coaxial and RCA sources with remote input switching.\u003c\/p\u003e\u003ch3\u003eTube character with visual appeal\u003c\/h3\u003e\u003cp\u003eReplaceable 5654W-family tubes and a warm VU meter add adjustable tube character and a retro presentation.\u003c\/p\u003e\u003ch3\u003eFlexible system expansion\u003c\/h3\u003e\u003cp\u003eDrives passive speakers while pre-out and 3.5mm headphone outputs support additional listening configurations.\u003c\/p\u003e\u003ch2\u003eBest for\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDesktop and small-room passive speaker systems\u003c\/li\u003e\n\u003cli\u003eUsers switching between computer, TV, Bluetooth and analog sources\u003c\/li\u003e\n\u003cli\u003eHeadphone and speaker listening from one compact component\u003c\/li\u003e\n\u003cli\u003eListeners who enjoy replaceable tubes and VU-meter styling\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eNot ideal for\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eTurntables without a built-in or external phono preamp\u003c\/li\u003e\n\u003cli\u003eSystems requiring HDMI ARC\u003c\/li\u003e\n\u003cli\u003ePassive subwoofers that need a dedicated powered subwoofer channel\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv class=\"emiuzek-product-content-images\" style=\"width:100%;max-width:1100px;margin:8px auto 32px;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0604\/7422\/8829\/files\/FosioAudioMC331003.webp?v=1758366705\" alt=\"Fosi Audio MC331 tube integrated amplifier power and core performance\" loading=\"lazy\" style=\"display:block;width:100%;max-width:1100px;height:auto;margin:0 auto 24px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0604\/7422\/8829\/files\/FosioAudioMC331006.webp?v=1758366705\" alt=\"Fosi Audio MC331 Bluetooth, USB, optical, coaxial and RCA connections\" loading=\"lazy\" style=\"display:block;width:100%;max-width:1100px;height:auto;margin:0 auto 24px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0604\/7422\/8829\/files\/FosioAudioMC331005.webp?v=1758366705\" alt=\"Fosi Audio MC331 passive speaker, headphone and powered subwoofer system scenarios\" loading=\"lazy\" style=\"display:block;width:100%;max-width:1100px;height:auto;margin:0 auto 24px;\"\u003e\n\u003c\/div\u003e\u003ch2\u003eEMiUZEK Buying Notes\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eMC331 is an integrated amplifier and can directly drive 4–8Ω passive speakers.\u003c\/li\u003e\n\u003cli\u003eIts RCA input is line level; a conventional turntable requires a phono preamp.\u003c\/li\u003e\n\u003cli\u003ePre-out is for an active subwoofer or downstream amplifier; it is not a passive subwoofer output.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003ch3\u003eCan MC331 drive passive speakers directly?\u003c\/h3\u003e\u003cp\u003eYes. Connect 4–8Ω passive speakers to its speaker terminals.\u003c\/p\u003e\u003ch3\u003eDoes it include a phono input?\u003c\/h3\u003e\u003cp\u003eNo. A turntable needs a built-in phono stage or a separate phono preamp before the RCA input.\u003c\/p\u003e\u003ch3\u003eCan I connect a TV?\u003c\/h3\u003e\u003cp\u003eYes, through optical, coaxial or RCA audio output. MC331 does not provide HDMI ARC.\u003c\/p\u003e\u003ch3\u003eCan I use headphones?\u003c\/h3\u003e\u003cp\u003eYes. It includes a front 3.5mm headphone output.\u003c\/p\u003e\u003ch3\u003eCan I add a subwoofer?\u003c\/h3\u003e\u003cp\u003eYes. Use pre-out with a powered subwoofer or another compatible downstream device.\u003c\/p\u003e\u003ch3\u003eAre the tubes replaceable?\u003c\/h3\u003e\u003cp\u003eYes. Officially listed compatible families include 6AK5, 6AK5W, 6Zh1P and 6J1.\u003c\/p\u003e\u003ch2\u003eHOW TO CONNECT\u003c\/h2\u003e\u003ch3\u003ePassive speaker system\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eSource:\u003c\/strong\u003e Phone, computer, TV or line-level source\u003cbr\u003e\u003cstrong\u003eConnection:\u003c\/strong\u003e Bluetooth, USB, optical, coaxial or RCA\u003cbr\u003e\u003cstrong\u003eOutput:\u003c\/strong\u003e Speaker terminals\u003cbr\u003e\u003cstrong\u003eTarget:\u003c\/strong\u003e 4–8Ω passive speakers\u003cbr\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Select the matching input and begin at low volume.\u003c\/p\u003e\u003ch3\u003eHeadphone setup\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eSource:\u003c\/strong\u003e Digital or analog source\u003cbr\u003e\u003cstrong\u003eConnection:\u003c\/strong\u003e Bluetooth, USB, optical, coaxial or RCA\u003cbr\u003e\u003cstrong\u003eOutput:\u003c\/strong\u003e 3.5mm headphone output\u003cbr\u003e\u003cstrong\u003eTarget:\u003c\/strong\u003e Wired headphones\u003cbr\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Disconnect or lower speaker output before private listening.\u003c\/p\u003e\u003ch3\u003e2.1 system with powered subwoofer\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eSource:\u003c\/strong\u003e Digital or analog source\u003cbr\u003e\u003cstrong\u003eConnection:\u003c\/strong\u003e Chosen source input\u003cbr\u003e\u003cstrong\u003eOutput:\u003c\/strong\u003e Speaker terminals + pre-out\u003cbr\u003e\u003cstrong\u003eTarget:\u003c\/strong\u003e Passive speakers + powered subwoofer\u003cbr\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Use the subwoofer's own level and crossover controls for integration.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ch3\u003eCore specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct type\u003c\/td\u003e\n\u003ctd\u003eTube integrated DAC \/ amplifier \/ headphone amplifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum speaker output\u003c\/td\u003e\n\u003ctd\u003e105W × 2 at 4Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpeaker impedance\u003c\/td\u003e\n\u003ctd\u003e4–8Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTHD\u003c\/td\u003e\n\u003ctd\u003e≤0.03%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSNR\u003c\/td\u003e\n\u003ctd\u003e≥100dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower supply\u003c\/td\u003e\n\u003ctd\u003e24V \/ 4.5A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eInputs and outputs\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eInputs\u003c\/td\u003e\n\u003ctd\u003eBluetooth, USB, optical, coaxial, RCA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutputs\u003c\/td\u003e\n\u003ctd\u003ePassive speaker terminals, pre-out, 3.5mm headphone output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBluetooth codecs\u003c\/td\u003e\n\u003ctd\u003eSBC, AAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReplaceable tubes\u003c\/td\u003e\n\u003ctd\u003e6AK5, 6AK5W, 6Zh1P, 6J1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eRecommended System Setup\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSetup\u003c\/th\u003e\n\u003cth\u003eConnection\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDesktop speakers\u003c\/td\u003e\n\u003ctd\u003ePC → USB → MC331 → Passive speakers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTV audio\u003c\/td\u003e\n\u003ctd\u003eTV optical output → MC331 → Passive speakers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2.1 system\u003c\/td\u003e\n\u003ctd\u003eSource → MC331 → Passive speakers + powered subwoofer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eAdditional Product Content\u003c\/h2\u003e\u003ch3\u003eFosi Audio product comparison\u003c\/h3\u003e\u003cp\u003eCompare the two compact Fosi Audio integrated amplifiers by the differences that most affect system matching.\u003c\/p\u003e\u003cdiv style=\"max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;\"\u003e\u003ctable style=\"min-width:760px;\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"min-width:150px;\"\u003eFeature\u003c\/th\u003e\n\u003cth style=\"min-width:190px;\"\u003eMC331\u003c\/th\u003e\n\u003cth style=\"min-width:190px;\"\u003eMC351\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct position\u003c\/th\u003e\n\u003ctd\u003eTube DAC \/ integrated stereo amplifier\u003c\/td\u003e\n\u003ctd\u003eHigh-power 2.1 digital integrated amplifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBuilt-in speaker amplifier\u003c\/th\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaximum output\u003c\/th\u003e\n\u003ctd\u003e105W × 2 at 4Ω\u003c\/td\u003e\n\u003ctd\u003e165W × 2 + 350W at 4Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMain inputs\u003c\/th\u003e\n\u003ctd\u003eBluetooth, USB, optical, coaxial, RCA\u003c\/td\u003e\n\u003ctd\u003eBluetooth 5.3, USB, optical, coaxial, RCA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpeaker output\u003c\/th\u003e\n\u003ctd\u003eStereo passive speakers\u003c\/td\u003e\n\u003ctd\u003eStereo passive speakers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePassive subwoofer output\u003c\/th\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003ctd\u003eYes, dedicated amplified output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLine-level pre-out\u003c\/th\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeadphone output\u003c\/th\u003e\n\u003ctd\u003eYes, 3.5mm\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTube stage\u003c\/th\u003e\n\u003ctd\u003eYes, replaceable tubes\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBest use\u003c\/th\u003e\n\u003ctd\u003eCompact tube stereo and headphone system\u003c\/td\u003e\n\u003ctd\u003ePowerful passive-speaker 2.1 system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e","brand":"Fosi Audio","offers":[{"title":"Black \/ US","offer_id":43673909035101,"sku":"Fosi-Audio-MC331-Black-US","price":732.0,"currency_code":"BRL","in_stock":true},{"title":"Black \/ EU","offer_id":43673909067869,"sku":"Fosi-Audio-MC331-Black-EU","price":662.0,"currency_code":"BRL","in_stock":true},{"title":"Black \/ AU","offer_id":43673909100637,"sku":"Fosi-Audio-MC331-Black-AU","price":662.0,"currency_code":"BRL","in_stock":true},{"title":"Black \/ UK","offer_id":43673909133405,"sku":"Fosi-Audio-MC331-Black-UK","price":662.0,"currency_code":"BRL","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0604\/7422\/8829\/files\/Fosi_Audio_MC331_f0e033c2-3c7e-4420-a18f-ed97a2880999.webp?v=1785378303","url":"https:\/\/emiuzek.com\/pt-br\/products\/fosi-mc331","provider":"EMiUZEK","version":"1.0","type":"link"}