{"product_id":"aune-audio-bx2-magnum-portable-headphone-amplifier","title":"Aune Audio BX2 Magnum Portable Headphone Amplifier","description":"\u003cp\u003eThe Aune BX2 Magnum is a portable headphone amplifier with two genuine Korg Nutube 6P1 vacuum tubes, a fully balanced four-channel Class A circuit, and up to 5 watts of output into 32 ohms, running entirely on its own seven-cell battery bank. Almost nothing else you can fit in a jacket pocket attempts this.\u003c\/p\u003e\n\u003cp\u003eThe BX2 Magnum is built for listeners who refuse to choose between a serious rig and a portable one. Feed it from a DAP, portable DAC, or desktop source through 3.5mm, 4.4mm balanced, or RCA inputs, and it drives IEMs and full-size headphones from 3.5mm and 4.4mm outputs with a choice of two completely different sonic characters.\u003c\/p\u003e\n\u003ch3\u003eTwo Amplifiers in One Chassis\u003c\/h3\u003e\n\u003cp\u003eA physical switch selects between tube mode and transistor mode, and the two signal paths are fully independent, joined only by latching relays that switch without coloring the signal. Transistor mode is the precision path: linear, fast, and measurably clean at 0.0003% THD+N from the balanced output. Tube mode routes the signal through the Nutubes for the warmth, body, and harmonic richness tubes are loved for, with distortion up to 1% because that character is the entire point.\u003c\/p\u003e\n\u003cp\u003eTwo gain levels and two Class A current settings multiply those characters further. Between mode, gain, and bias, the BX2 Magnum offers eight distinct operating combinations to match headphones and mood.\u003c\/p\u003e\n\u003ch3\u003eReal Tubes, Properly Driven\u003c\/h3\u003e\n\u003cp\u003eThe Korg Nutube 6P1 is a true dual-triode vacuum tube, and in the BX2 Magnum both tubes sit genuinely in the amplification stage rather than glowing decoratively behind a window. A dedicated 30V anode supply pushes them into their optimal linear range, the voltage headroom portable tube stages usually lack. Ahead of them, a twin JFET input stage adds its naturally smooth transfer characteristic, and the fully balanced four-channel layout keeps left and right isolated for precise imaging.\u003c\/p\u003e\n\u003ch3\u003eSeven Batteries, Each with a Job\u003c\/h3\u003e\n\u003cp\u003ePower is the reason the BX2 Magnum sounds like desktop gear. Its 14,000mAh battery bank uses seven independent 2000mAh cells: six form a true plus and minus 12V analog supply feeding the amplifier directly, while the seventh runs the digital control circuits in complete isolation, keeping control noise out of the music. Two four-segment indicators on the rear panel track both banks in real time.\u003c\/p\u003e\n\u003cp\u003eA full charge over USB-C takes about five hours and delivers up to 13 hours in transistor mode or more than 8 hours in tube mode, enough for a work day on the solid-state path or a long evening on the tubes.\u003c\/p\u003e\n\u003ch3\u003eA Desk Mode, Thanks to the BP1\u003c\/h3\u003e\n\u003cp\u003eA five-pin external power input lets the BX2 Magnum bypass its battery entirely and run on plus and minus 15V from Aune's \u003ca href=\"\/products\/aune-audio-bp1-external-power-supply\" title=\"Aune Audio BP1 External Power Supply\" target=\"_blank\" rel=\"noopener\"\u003eBP1 external power supply\u003c\/a\u003e, sold separately and built in the same stackable chassis. On the desk it runs at higher rails than the battery provides while the cells sit idle; on the move the battery takes over again. One amplifier honestly covers both lives.\u003c\/p\u003e\n\u003ch3\u003eMeasured Like a Desktop Amp\u003c\/h3\u003e\n\u003cp\u003eThe numbers hold up against amplifiers that never leave a shelf: output noise of 3 microvolts or less, signal-to-noise ratio above 117dB, and a 31-step R2R digital volume control that keeps channels matched at low listening levels with no contact noise. High gain delivers 5,180mW balanced into 32 ohms and 644mW into 300 ohms, so hard planars and high-impedance dynamics both stay on the menu. Check your own pair against the table below with our \u003ca href=\"\/pages\/headphones-power-calculator\" title=\"Headphone power calculator\" target=\"_blank\" rel=\"noopener\"\u003eheadphone power calculator\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eHow the BX2 Magnum Compares\u003c\/h3\u003e\n\u003cp\u003eIts closest relative is Aune's desktop \u003ca href=\"\/products\/aune-audio-s17-pro-evo-headphone-amplifier\" title=\"Aune Audio S17 Pro EVO Headphone Amplifier\" target=\"_blank\" rel=\"noopener\"\u003eS17 Pro EVO\u003c\/a\u003e, which shares the twin JFET input and Class A philosophy with more raw power and a wall socket. The BX2 Magnum is the version of that idea you can take with you, and it adds something the desktop amp does not have: real vacuum tubes and a second sonic personality. In the portable amplifier category, that combination has essentially no direct rival at $799.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePortable Class A headphone amplifier with tube and transistor modes\u003c\/li\u003e\n\u003cli\u003eDual Korg Nutube 6P1 vacuum tubes, genuinely active in the signal path\u003c\/li\u003e\n\u003cli\u003e30V anode supply runs the tubes in their optimal linear range\u003c\/li\u003e\n\u003cli\u003eFully balanced four-channel discrete architecture with twin JFET input\u003c\/li\u003e\n\u003cli\u003ePhysically independent signal paths with latching relay switching\u003c\/li\u003e\n\u003cli\u003eUp to 5W into 32 ohms; 5,180mW balanced at high gain\u003c\/li\u003e\n\u003cli\u003eTwo gain levels and two Class A current settings\u003c\/li\u003e\n\u003cli\u003e14,000mAh seven-cell battery: six cells for +\/-12V analog, one for digital\u003c\/li\u003e\n\u003cli\u003eUp to 13 hours battery life in transistor mode, over 8 hours in tube mode\u003c\/li\u003e\n\u003cli\u003eExternal power input for the BP1 power supply (sold separately)\u003c\/li\u003e\n\u003cli\u003e31-step R2R digital volume control with precise channel matching\u003c\/li\u003e\n\u003cli\u003e3.5mm, 4.4mm balanced, and RCA inputs; 3.5mm and 4.4mm outputs\u003c\/li\u003e\n\u003cli\u003eOutput noise 3uV or lower; SNR above 117dB\u003c\/li\u003e\n\u003cli\u003eAll-aluminum CNC chassis in black and gold\u003c\/li\u003e\n\u003cli\u003eUSB-C charging at 5V\/2A\u003c\/li\u003e\n\u003cli\u003eHi-Res Audio certification\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specs\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003ePortable Class A headphone amplifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTubes\u003c\/td\u003e\n\u003ctd\u003eDual Korg Nutube 6P1 with 30V anode supply\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eArchitecture\u003c\/td\u003e\n\u003ctd\u003eFully balanced four-channel discrete, twin JFET input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModes\u003c\/td\u003e\n\u003ctd\u003eTube \/ Transistor, relay-switched independent paths\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGain and Current\u003c\/td\u003e\n\u003ctd\u003eTwo gain levels, two Class A current settings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolume Control\u003c\/td\u003e\n\u003ctd\u003e31-step R2R digital volume\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInputs\u003c\/td\u003e\n\u003ctd\u003e3.5mm (10K ohm), 4.4mm balanced (32K ohm), dual RCA (10K ohm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutputs\u003c\/td\u003e\n\u003ctd\u003e3.5mm and 4.4mm headphone outputs (1 ohm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency Response\u003c\/td\u003e\n\u003ctd\u003e20Hz - 80kHz, +\/-0.05dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTHD+N\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;=0.0003% (4.4mm, transistor mode); \u0026lt;=0.0005% (3.5mm, transistor mode); \u0026lt;=1% (tube mode)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Noise\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;=3uV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSNR\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;117dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrosstalk\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; -100dB at 1kHz, 600 ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery\u003c\/td\u003e\n\u003ctd\u003e7 x 2000mAh (14,000mAh): six cells +\/-12V analog, one cell digital\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery Life\u003c\/td\u003e\n\u003ctd\u003eUp to 13 hours (transistor mode); over 8 hours (tube mode)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharging\u003c\/td\u003e\n\u003ctd\u003eUSB-C 5V\/2A; approx. 5 hours\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal Power\u003c\/td\u003e\n\u003ctd\u003e5-pin input, +15V\/-15V\/+5V (Aune BP1, sold separately)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e186 x 92 x 38mm (198mm including knob)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eHeadphone Output Power (High Gain)\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eLoad\u003c\/th\u003e\n\u003cth\u003e3.5mm Single-Ended\u003c\/th\u003e\n\u003cth\u003e4.4mm Balanced\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e32 ohms\u003c\/td\u003e\n\u003ctd\u003e1,400mW\u003c\/td\u003e\n\u003ctd\u003e5,180mW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e100 ohms\u003c\/td\u003e\n\u003ctd\u003e476mW\u003c\/td\u003e\n\u003ctd\u003e1,850mW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e250 ohms\u003c\/td\u003e\n\u003ctd\u003e196mW\u003c\/td\u003e\n\u003ctd\u003e770mW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e300 ohms\u003c\/td\u003e\n\u003ctd\u003e163mW\u003c\/td\u003e\n\u003ctd\u003e644mW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e600 ohms\u003c\/td\u003e\n\u003ctd\u003e81mW\u003c\/td\u003e\n\u003ctd\u003e320mW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAune BX2 Magnum portable headphone amplifier\u003c\/li\u003e\n\u003cli\u003e3.5mm to 3.5mm cable\u003c\/li\u003e\n\u003cli\u003e4.4mm to 4.4mm cable\u003c\/li\u003e\n\u003cli\u003eUSB-C to USB-C charging cable\u003c\/li\u003e\n\u003cli\u003eVelvet pouch\u003c\/li\u003e\n\u003cli\u003e4 spare silicone feet\u003c\/li\u003e\n\u003cli\u003eQuick start guide and warning card\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Aune Audio","offers":[{"title":"Default Title","offer_id":43019428364359,"sku":"AUNE-BX2","price":799.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1791\/0383\/files\/1_690ad6f4-073c-4eb8-af3e-f40d4dc8a02e.jpg?v=1785368645","url":"https:\/\/headphones.com\/products\/aune-audio-bx2-magnum-portable-headphone-amplifier","provider":"Headphones.com","version":"1.0","type":"link"}