{"product_id":"xduoo-mt-04","title":"xDuoo MT-04 Balanced Hybrid Tube Headphone Amplifier","description":"\u003ch2\u003exDuoo MT-04 Balanced Hybrid Tube Headphone Amplifier\u003c\/h2\u003e\u003cp\u003eThe xDuoo MT-04 pairs dual 6H3 vacuum tubes with a transistor-based Class A output stage, combining tube-stage character with solid-state drive in a compact desktop headphone amplifier. Balanced and unbalanced connections, adjustable gain and a transparent-panel design make it a versatile addition to a wired listening setup.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eTwo 6H3 vacuum tubes in the preamplifier stage.\u003c\/li\u003e\n\u003cli\u003eHybrid tube-transistor design with Class A current amplification.\u003c\/li\u003e\n\u003cli\u003eBalanced headphone output rated at 2200mW into 32Ω.\u003c\/li\u003e\n\u003cli\u003eRCA analog, XLR balanced and 4.4mm balanced inputs.\u003c\/li\u003e\n\u003cli\u003e4.4mm balanced and 6.35mm unbalanced headphone outputs.\u003c\/li\u003e\n\u003cli\u003eSelectable +12dB \/ +18dB gain.\u003c\/li\u003e\n\u003cli\u003eELNA audio coupling capacitors and Rubycon filter capacitors.\u003c\/li\u003e\n\u003cli\u003eRelay protection with a 30-second power-on delay.\u003c\/li\u003e\n\u003cli\u003eAluminum alloy enclosure with clear acrylic front and rear panels.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTube Warmth Meets Transistor Control\u003c\/h3\u003e\u003cp\u003eThe dual 6H3 tubes provide the preamplification stage, with manufacturer-described full midrange, smooth vocals and gentle treble. The transistor power stage provides current drive and control for bass impact and dynamic passages. This hybrid architecture is intended to balance an inviting tonal presentation with responsive headphone amplification.\u003c\/p\u003e\u003cp\u003eConnect an analog source, choose the appropriate gain and settle into an album: the MT-04 offers tube-based listening character without requiring a large desktop footprint. Actual sound and listening level depend on your headphones, source and volume setting.\u003c\/p\u003e\u003ch3\u003eClass A Output Stage\u003c\/h3\u003e\u003cp\u003eThe transistor-based Class A current-expansion circuit is designed for transient response and control. The balanced output provides up to 2200mW into 32Ω, with separate manufacturer ratings for loads up to 600Ω. Impedance alone does not determine headphone compatibility; sensitivity and required listening level also matter.\u003c\/p\u003e\u003ch3\u003eBalanced \u0026amp; Unbalanced Connections\u003c\/h3\u003e\u003cp\u003eChoose RCA analog, XLR balanced or 4.4mm balanced input to match your source. Front headphone connections include 4.4mm balanced and 6.35mm unbalanced outputs. The supplied figures specify higher channel separation and signal-to-noise performance for the balanced output.\u003c\/p\u003e\u003cp\u003eThis is an analog headphone amplifier, not a DAC. Bluetooth and a built-in battery are not included.\u003c\/p\u003e\u003ch3\u003eAdjustable Gain \u0026amp; Ground Terminal\u003c\/h3\u003e\u003cp\u003eAn external switch selects +12dB or +18dB gain for different listening requirements. Start with low gain and a low volume setting, particularly with sensitive earphones. The external grounding post is intended to help address grounding-related hum or static interference when correctly connected; it is not a guarantee that all system noise will be eliminated.\u003c\/p\u003e\u003ch3\u003eAudio-Grade Components \u0026amp; Relay Protection\u003c\/h3\u003e\u003cp\u003eELNA coupling capacitors and Rubycon filter capacitors support the analog circuit. The protection system provides a 30-second power-on delay for tube warm-up and is designed to reduce switching pops, with overload and short-circuit protection.\u003c\/p\u003e\u003ch3\u003eAluminum Body with Clear Panels\u003c\/h3\u003e\u003cp\u003eThe aluminum alloy chassis helps shield the electronics from electromagnetic interference, while clear acrylic front and rear panels reveal the internal components. At 13.6 × 11.0 × 8.1cm and approximately 0.61kg, the MT-04 fits compact desktop systems.\u003c\/p\u003e\u003ch3\u003eGeneral Specifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand \/ model\u003c\/th\u003e\n\u003ctd\u003exDuoo MT-04\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eArchitecture\u003c\/th\u003e\n\u003ctd\u003eTube preamplification with transistor Class A power stage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTubes\u003c\/th\u003e\n\u003ctd\u003e2 × 6H3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChannels\u003c\/th\u003e\n\u003ctd\u003e2-channel stereo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInputs\u003c\/th\u003e\n\u003ctd\u003eRCA analog \/ XLR balanced \/ 4.4mm balanced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHeadphone outputs\u003c\/th\u003e\n\u003ctd\u003e4.4mm balanced \/ 6.35mm unbalanced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrequency response\u003c\/th\u003e\n\u003ctd\u003e10Hz–60kHz (+0.5dB, as supplied)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGain\u003c\/th\u003e\n\u003ctd\u003e+12dB \/ +18dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower requirement\u003c\/th\u003e\n\u003ctd\u003eDC 12V \/ 2A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003e13.6 × 11.0 × 8.1cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e0.61kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eConstruction\u003c\/th\u003e\n\u003ctd\u003eAluminum alloy body; acrylic front and rear panels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBluetooth \/ battery\u003c\/th\u003e\n\u003ctd\u003eNo \/ no\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOrigin\u003c\/th\u003e\n\u003ctd\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eHeadphone Output Power\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eLoad\u003c\/th\u003e\n\u003cth\u003e6.35mm Unbalanced\u003c\/th\u003e\n\u003cth\u003e4.4mm Balanced\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e32Ω\u003c\/td\u003e\n\u003ctd\u003e1800mW\u003c\/td\u003e\n\u003ctd\u003e2200mW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e75Ω\u003c\/td\u003e\n\u003ctd\u003e1000mW\u003c\/td\u003e\n\u003ctd\u003e1200mW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e150Ω\u003c\/td\u003e\n\u003ctd\u003e650mW\u003c\/td\u003e\n\u003ctd\u003e800mW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e300Ω\u003c\/td\u003e\n\u003ctd\u003e330mW\u003c\/td\u003e\n\u003ctd\u003e400mW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e600Ω\u003c\/td\u003e\n\u003ctd\u003e165mW\u003c\/td\u003e\n\u003ctd\u003e200mW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eOutput Performance\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eUnbalanced\u003c\/th\u003e\n\u003cth\u003eBalanced\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrosstalk figure\u003c\/td\u003e\n\u003ctd\u003e76dB\u003c\/td\u003e\n\u003ctd\u003e85dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSNR\u003c\/td\u003e\n\u003ctd\u003e118dB\u003c\/td\u003e\n\u003ctd\u003e125dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTHD\u003c\/td\u003e\n\u003ctd\u003e0.1% (-60dB)\u003c\/td\u003e\n\u003ctd\u003e0.08% (-62dB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003eAll performance figures are manufacturer-provided. Measurement conditions were not specified in the supplied text and may affect results.\u003c\/p\u003e\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e1 × xDuoo MT-04 headphone amplifier.\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003eThe complete accessory bundle was not specified in the supplied information. Please confirm the included power adapter, regional mains plug and other accessories before ordering if required.\u003c\/p\u003e\u003ch3\u003eBefore You Listen\u003c\/h3\u003e\u003cp\u003eUse a power supply matching the specified DC 12V \/ 2A requirement and follow the manufacturer's instructions. Allow the startup delay to complete before listening. Keep the unit ventilated, avoid touching hot tubes during use and switch off the amplifier before changing connections.\u003c\/p\u003e\u003ch3\u003eManufacturer Product Details\u003c\/h3\u003e\u003cdiv style=\"margin:0;padding:0;line-height:0;\"\u003e\n\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S5ff0ac69f805460ea8957c727fd6cb77L.jpg\" style=\"display:block;width:100%;max-width:100%;height:auto;margin:0;padding:0;\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S4f1c0b3b485246a9bbc86b65cb367f70d.jpg\" style=\"display:block;width:100%;max-width:100%;height:auto;margin:0;padding:0;\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sf701c532713644f2b282d90d5ece54ecX.jpg\" style=\"display:block;width:100%;max-width:100%;height:auto;margin:0;padding:0;\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S2928dbdc7512468aab406da15a420962p.jpg\" style=\"display:block;width:100%;max-width:100%;height:auto;margin:0;padding:0;\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sde2b4e7cd19a4fe8922f40db6a7a3bceh.jpg\" style=\"display:block;width:100%;max-width:100%;height:auto;margin:0;padding:0;\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S1f9b9b60d75e49a084530117d4258b38l.jpg\" style=\"display:block;width:100%;max-width:100%;height:auto;margin:0;padding:0;\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Seb2077f9bdc549b1ab3ec778c697570fu.jpg\" style=\"display:block;width:100%;max-width:100%;height:auto;margin:0;padding:0;\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S2bc00088fd8b48998af05bf6c0700a61A.jpg\" style=\"display:block;width:100%;max-width:100%;height:auto;margin:0;padding:0;\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S58bb59ed0f264f3aa17f02ab545e853dE.jpg\" style=\"display:block;width:100%;max-width:100%;height:auto;margin:0;padding:0;\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S39ad9af3734346cab887f4a7f7b77d14B.jpg\" style=\"display:block;width:100%;max-width:100%;height:auto;margin:0;padding:0;\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S249c0dffcaf2488b85f0c8d293ae77189.jpg\" style=\"display:block;width:100%;max-width:100%;height:auto;margin:0;padding:0;\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S0a30a16c81e648f09b1c707cf39a72c19.jpg\" style=\"display:block;width:100%;max-width:100%;height:auto;margin:0;padding:0;\"\u003e\n\u003c\/div\u003e","brand":"xDuoo","offers":[{"title":"black","offer_id":51351704273135,"sku":"1005013431967855-black","price":199.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0626\/2004\/1455\/files\/xduoo-mt-04-balanced-hybrid-tube-headphone-amplifier-2644782.webp?v=1793718609","url":"https:\/\/thehificat.com\/pl\/products\/xduoo-mt-04","provider":"The HiFi Cat","version":"1.0","type":"link"}