{"product_id":"auris-headonia-mk-ii-reference-300b-headphone-amplifier","title":"Auris Headonia Mk II Reference 300B Headphone Amplifier","description":"\u003ch1\u003eAuris Headonia 300B Mk II Headphone Amplifier\u003c\/h1\u003e\n\u003ch3\u003eSingle-ended 300B reference design with impedance matching, premium components, and a special output for true-ribbon headphones\u003c\/h3\u003e\n\u003cp\u003eAuris builds on the already legendary Headonia with the Mk II. Here are some of the improvements:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eA redesigned power profile chassis that's similar to that of the Adagio\u003c\/li\u003e\n\u003cli\u003eAbility to use mesh-plate tubes with a switch to select between mesh and standard 300B \u003c\/li\u003e\n\u003cli\u003eA true ribbon output mode  via 4-pin male XLR for all RAAL headphones. The $2,000 RAAL transformer is no longer needed\u003c\/li\u003e\n\u003cli\u003eNew “barrel” adapter transformers for a much better sound\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe Auris Headonia 300B Mk II is the reference model from Auris Audio, designed to exceed the demands of today’s high-end headphones. With two 300B power tubes, two 6SN7 input tubes, and 7 W of single-ended output, the Headonia delivers the power, headroom, and authority that contemporary premium headphones require—all while retaining the signature warmth and harmonic richness of classic 300B topology.\u003c\/p\u003e\n\u003cp\u003eSerbia produces the best copper on the planet, and Auris uses it to wind its custom output transformers. Good output transformers offer huge bandwidth and dynamics and do justice to the high-quality components used upstream. \u003c\/p\u003e\n\u003ch4\u003eThe Single-Ended 300B Signature\u003c\/h4\u003e\n\u003cp\u003eThe amplifier’s single-ended 300B architecture is built for natural tone and musicality. These tubes are prized for their organic, fluid presentation, revealing texture and micro-detail without losing body or weight. Auris leans into the strengths of the 300B design to produce a sound that is richly layered, holographic, and exceptionally lifelike across the entire frequency spectrum.\u003c\/p\u003e\n\u003ch4\u003eImpedance Matching for Total Compatibility\u003c\/h4\u003e\n\u003cp\u003eMany tube headphone amplifiers commit to one fixed output impedance, but the Headonia 300B offers a front-panel impedance selector tied to the output transformer secondaries. This allows proper matching to headphones from 32 to 600 ohms, preserving dynamics, maintaining clarity, and ensuring optimal damping. Whether you rotate through several headphones or use a single reference pair, the Headonia adapts to each model with precision.\u003c\/p\u003e\n\u003ch4\u003ePremium Build and Vibration Control\u003c\/h4\u003e\n\u003cp\u003eThe chassis is machined from thick 8–10 mm aluminum, chosen for rigidity, shielding, and long-term stability. Auris further improves mechanical quieting through a rubber-plastic-metal sandwich foot design that limits transmitted vibration. The result is a low-noise platform that maintains purity of tone and preserves the amplifier’s expressive character.\u003c\/p\u003e\n\u003ch4\u003eTop-Tier Components Throughout\u003c\/h4\u003e\n\u003cp\u003eInside the chassis, Auris specifies high-grade parts chosen for longevity and sonic stability. Japanese Alps potentiometers provide smooth and precise volume control. German-made Mundorf capacitors preserve signal integrity and dynamic expression. Balanced inputs are handled by Lundahl transformers, which contribute exceptional noise rejection and enhanced refinement.\u003c\/p\u003e\n\u003ch4\u003eFlexible Balanced and Single-Ended Connectivity\u003c\/h4\u003e\n\u003cp\u003eThe Headonia 300B includes both single-ended and transformer-coupled balanced inputs, offering broad source compatibility while ensuring optimal signal integrity. A preamp output allows the amplifier to function as the control center of a system when feeding external power amplifiers or active loudspeakers. For headphones, both 6.3 mm and 4-pin XLR outputs are provided, supporting the vast majority of aftermarket cables.\u003c\/p\u003e\n\u003ch4\u003eCrafted for Long-Term Reference Listening\u003c\/h4\u003e\n\u003cp\u003eAuris designs the Headonia 300B with longevity and consistency in mind, pairing heavy-duty construction with a timeless, understated industrial design. The warm glow of the 300B tubes reinforces the amplifier’s vintage-meets-modern appeal, making it a visually striking centerpiece in any listening space.\u003c\/p\u003e\n\u003ch4\u003eA Statement of Craftsmanship and Performance\u003c\/h4\u003e\n\u003cp\u003eThe Headonia 300B is built as a no-compromise instrument for discerning audiophiles. Its combination of power, flexibility, premium components, and classic tube character makes it a compelling choice for anyone seeking a reference-grade headphone amplifier that excels across genres and headphone types.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eAnalog Inputs:\u003c\/b\u003e 2 x RCA, 1 x XLR\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eAnalog Outputs:\u003c\/b\u003e 1 x 6.3 mm, 1 x XLR, 1 x RCA pre, 1 x XLR pre\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTubes:\u003c\/b\u003e 2 x 300B, 2 x CV181\/6SN7\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eMax Power Output:\u003c\/b\u003e 7 W\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOutput Impedance:\u003c\/b\u003e 32\/80\/200 ohm\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eHeadphone Output Power:\u003c\/b\u003e 7 W\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eHeadphone Output Voltage (32 ohm, 80 ohm, 200 ohm):\u003c\/b\u003e 15 V, 23.5 V, 37.5 V\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eHeadphone THD+N:\u003c\/b\u003e 0.4% at 1 W; 2% max power, Low Gain; 7% max power, High Gain\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSNR:\u003c\/b\u003e 100 dB\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eInput Sensitivity (SE, Balanced):\u003c\/b\u003e 0.8 V, 3.1 V\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePre-Out Max Output Voltage:\u003c\/b\u003e 17 V\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePre-Out SNR:\u003c\/b\u003e 100 dB\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDimensions (LWH):\u003c\/b\u003e 18.11\" x 17.32\" x 10.83\" (460 x 440 x 275 mm)\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eWeight:\u003c\/b\u003e 43 lb. (19.5 kg)\u003c\/p\u003e","brand":"Auris","offers":[{"title":"Default Title","offer_id":53364782301368,"sku":"HEADONIA-MK2","price":15900.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/head1.jpg?v=1777578011","url":"https:\/\/upscaleaudio.com\/products\/auris-headonia-mk-ii-reference-300b-headphone-amplifier","provider":"Upscale Audio","version":"1.0","type":"link"}