EvoOne

Triple Analog Audio Architecture Adapts to Users' Diverse Auditory Preferences
It features full-transistor drive and hybrid drive with two types of vacuum tubes plus transistors. The structure allows for switching analog signal paths, making it possible to pursue the optimal point tailored to user preferences and music genres. The fully discrete transistors deliver a clean, transparent sound with clear soundstage contours. Hybrid drive achieves a vivid and rich sound in addition to clarity. Furthermore, with hybrid drive, by controlling the distribution of even-order harmonics when the analog audio signal passes through the vacuum tubes, the sound character is changed: "Velvet" offers more appealing vocal characteristics, and "Lumina" emphasizes rich detail. Additionally, it is equipped with a two-stage (High/Low) adjustment function for Nutube's anode voltage, allowing for precise adjustment of the warmth and richness of overtones unique to vacuum tubes, to match the user's auditory perception. It provides a luxurious experience where you can savor the "sweet spot" of analog vacuum tube devices, at its best for the characteristics of the music and earphones.

High Voltage: Modern and dynamic tendency
Drives the vacuum tube in a more linear region.
While maintaining the luster and smoothness characteristic of vacuum tubes, distortion is suppressed, and dynamic range and S/N ratio are improved. It provides a taut sound that is ideal for modern high-resolution audio sources, classical music, and EDM, for those who "want the flavor of vacuum tubes but don't want to sacrifice resolution or speed."

Low Voltage: Rich and vintage tendency
Shifts the vacuum tube operation to a more nonlinear region, bringing out the essence of the vacuum tube.
Harmonic components become richer, and the sound becomes softer and thicker. This is suitable for situations where "flavor" and "euphoria" are prioritized over signal purity, such as adding allure to the breathiness of vocals or playing old jazz recordings with an abundance of atmosphere.

【Parallel Differential DAC x Proprietary 8-Channel Independent I/V Conversion: A Parallel Differential Decoding System Beyond Portable Boundaries】
The DAC section of EvoOne employs a parallel differential DAC configuration built around two AK4191EQ chips and four AK4499EXEQ chips from AKM. This module boasts extremely high performance metrics and faithfully reproduces musical signals with high fidelity. To ensure every drop of its full potential is channeled solely into enhancing signal purity, we designed our own I/V conversion as the starting point.
Each AK4499EXEQ operates in MONO mode, ensuring thorough full-balanced transmission. The current output signal extracted from these is then passed to our proprietary 8-channel independent I/V conversion stage, comparable to those found in high-end stationary units. By segmenting the signal and processing it in parallel, noise is canceled out, and an extremely accurate audio signal is rectified for the subsequent LPF, Buffer, and fully symmetrical discrete amplification stages. While large-scale and seemingly inefficient, such a thorough design is necessary to eliminate any loss and provide listeners with overwhelming resolution, dynamic range, and even the emotional nuances of a performance.

【High-Quality Low-Pass Filtering to Eliminate Digital Noise】
The EvoOne is equipped with two AD8620ARZ OP amps from Analog Devices. It employs a 4-channel low-pass filter circuit. Its excellent low-noise performance carefully refines signal purity, supporting a highly transparent and clean signal path, and background reproduction with superior quietness. It also effectively suppresses noise and interference during signal transmission, allowing for a clearer depiction of subtle details and delicate sound textures.

【Ultra-Low Noise Fully Balanced Volume Control System】
To maintain consistent sound quality performance while minimizing stress on the signal, the EvoOne incorporates two MUSES72320 volume control chips from Nisshinbo Micro Devices (formerly JRC), employing a fully balanced 4-channel hardware-based volume/gain control system. High-precision control effectively suppresses noise accumulation and signal distortion that often occur with conventional digital volume adjustments, stably reproducing both subtlety and large dynamics across the entire volume range. This ensures consistent sound quality performance. Its ultra-low noise design makes it suitable for a wide range of uses, from high-sensitivity earphones to listening environments demanding high quietness.

【Ultimate Circuitry Enabling Industry-First Dual Negative Feedback】
The EvoOne delivers the highest quality sound under any conditions, perfectly adapting to all variables such as IEM characteristics, connected load environments, and listening preferences. To achieve this, the EvoOne employs a circuit design and manufacturing process that can be described as the pinnacle of fully discrete amplification, providing the best linear amplification state.
The EvoOne's amplification circuit consists of three stages: a JFET dual input stage, and transistor-based driver and output stages, all designed with a fully symmetrical structure. To realize this full differential circuit, which uses identical circuits to individually amplify the positive and negative half-cycles of the signal, a large number of JFETs and transistors are carefully tested and measured over time. Only components with perfectly matched electrical characteristics are rigorously paired and integrated into the same unit. In addition, by combining full discrete, high-linearity topology across all stages with engineering such as independent ultra-low noise power supplies for each stage, ultra-low ESR filtering, DC servo, and strict temperature control design, distortion and noise are suppressed from their source. This provides a musical experience with a sense of reality rising from an unfathomable quiet background, devoid of any noise, and an overwhelming amount of information, so much so that one might perceive the subtle breathing of the performer as if being present at the scene.

The hybrid mode with vacuum tube + transistor, P/P+/TURBO output switching, Class A/AB switching, and 2-stage vacuum tube voltage switching, among other adjustment points in the EvoOne, function seamlessly while maintaining high purity quality. This is due to the ultimate circuit foundation that operates perfectly in its raw state. Whether it's the transparent and endlessly expansive soundstage provided by the high-precision Non-NFB circuit, or the rich, tangible sound achieved by locally introducing NFB correction to the driver stage to suppress loop delays and phase distortion, the ultimate choice aligned with your desired musical expression is possible only through the crystallization of a perfectly constructed circuit that eliminates compromise. The foundation, refined to its utmost quality, delivers an authentic and moving musical experience with any setting.

【Dual Negative Feedback Structure】
Equipped with NFB/Non-NFB switching functionality, allowing selection based on music and listening style. An unprecedented circuit structure with wide adaptability to suit desired musical expression.

NFB Mode: Suppresses loop delay and phase shift.
Achieves both dynamic expression with quick response and excellent control. Adds thickness to the mid-range, bringing a deeper sense of reality to musical expression.

Non-NFB: Sound with high transparency and natural spaciousness.
Provides a listening experience that allows for relaxed and comfortable enjoyment of music, with expansive spaciousness and a wide soundstage.

【Class A/Class AB Amplifier Characteristic Switching】
The amplifier's operating mode, which affects sound quality and operating time, can be adjusted to the user's ideal style.

『Class A』
Achieves smoother signal reproduction without distortion.
Delivers intricate sound textures and more natural musical expression, but has low power efficiency due to constantly flowing high current.

『Class AB』
High-efficiency operation that balances excellent sound quality and powerful dynamics while suppressing power consumption by appropriately switching between Class A and Class B operation depending on the signal.

【Multi-Stage Independent Power System for an Authentic Musical Experience】
The EvoOne aims for both overwhelming energy and pristine quietness. Its reproduction capability, comparable to a stationary device, allows it to play at a large scale without collapsing the sound image or muddying the soundstage, naturally rendering even subtle reverberations and expressions. Supporting this playback accuracy from the ground up is the multi-stage independent power system design. High-quality components selected for each section optimize the power quality, ensuring that each circuit block—high-output A/AB class amplifiers, vacuum tube circuits, DAC, FPGA, and clock—operates under its ideal conditions.
By responding to instantaneous high current demands in milliseconds, suppressing dynamic compression due to voltage fluctuations, and incorporating independent power supplies and low-noise LDO regulation into each circuit, the system eliminates mutual interference and noise coupling, refining signal processing accuracy and analog stage quality to the extreme. With a 10000mAh high-capacity battery and a farad-class ELDC supercapacitor at its core, and by separating and optimizing each layer of the power supply supporting the entire playback system, it delivers power, control, clarity, silence, subtle nuances, and natural spatial expression. Furthermore, it supports "DC Mode" with external DC input of 9V or more, considering both stability and the long-term usability of the built-in battery.

【Supercapacitor Power System】
To render both subtle expressions and large dynamics with the same precision, the power supply itself must have sufficient headroom and responsiveness. Insufficient supply capability inevitably leads to sound quality degradation. This unit employs a flagship-grade ELDC supercapacitor for its main power supply. It functions as a large-capacity power reservoir, designed to respond to instantaneous current demands with ample reserve.
Its ultra-low ESR and high-speed charge/discharge performance are combined with a 10000mAh 3.87V dedicated matched battery pack, forming a powerful energy core in a 2-cell parallel configuration. This stable and high-impulse power supply supports the transient response of sound, bass control, and overall clarity across the frequency range. It allows for the reproduction of delicate nuances in quiet passages without loss, and ensures that the sound image remains stable even during moments of high energy. This leads to a rich, unconstrained playback experience.

【Achieving Pure Dynamic Expression】
In the high-output amplifier stage, the symmetry of the positive and negative power supplies and their responsiveness to signal fluctuations significantly impact playback quality. A power management circuit using two ADI LT8334s precisely constructs symmetrical positive and negative power rails. By combining twelve Panasonic low-ESR polymer capacitors with primary Panasonic low-ESR solid capacitors, a multi-stage filtering configuration is formed. This broadly suppresses everything from low-frequency ripples to high-frequency noise components, establishing a stable power foundation capable of responding to instantaneous high current demands. Stable power supply not only prevents dynamic range compression and distortion but also achieves a high level of both solid, powerful bass control and extremely delicate high-frequency reproduction. Eliminating subtle current noise and high-frequency harshness, the unprecedented感动 that arises from a background of overwhelming silence is a pure, unblemished sound.

【Triple Power Output Mode: Meticulously Responding to Required Drive Conditions】
Equipped with a 3-stage output switching function: P/P+/Turbo.
Designed to provide the optimal operating environment for connected devices, it achieves adaptability that matches a wide range of loads. It flexibly accommodates a wide range of loads, from multi-driver IEMs to headphones.
Achieves a high output of up to 1300mW at 32Ω. By ensuring ample headroom, it enables high-quality driving comparable to that of a desktop unit, delving into sound attack, low-frequency control, and the stability of spatial representation. In Turbo mode, the amplifier circuit is fixed to Class A maximum operation, regardless of power consumption. By increasing the operating current and voltage swing, it achieves unwavering driving power and stable control performance even for low-efficiency models and high-impedance headphones.

【Unique Characteristics Born from Titanium and Copper: A Housing Designed to Carry the Highest Quality】
The EvoOne's housing is crafted from two materials, titanium and copper, to leverage their respective physical and electrical properties. Based on precise CNC machining, multiple surface finishes are applied to achieve both a robust feel and a rich, deep texture. The exterior is designed with the refined form of a craft object, while also pursuing a shape that feels perfectly natural in hand. We aimed to create a design that inspires a desire to pick it up, balancing stately appearance with everyday usability. In addition to its portability, material selection and structural design also consider heat dissipation, which impacts playback quality. As a pinnacle of portable devices, it offers uniqueness, aesthetic beauty, portability, and quality that can be used in any environment.

【High Sound Completeness Driven by Optimized Dedicated PCBs】
There are clear differences in conductivity, electromagnetic shielding, and mechanical properties between Cu and Ti. EvoAria recognizes that these differences affect the circuit's operating environment and ultimately manifest as distinct sound characteristics. This is precisely why, instead of simply unifying the design specifications, EvoOne creates separate PCB layouts and power/ground designs for each material, all built upon a common platform. The Ti version is a specialized design that leverages the lightness and high rigidity of aerospace-grade TC4 titanium alloy to refine transparency and expansiveness. The Cu version is a specialized design that actively incorporates the high conductivity and shielding properties of high-purity brass to draw out deep silence and unblemished dynamics. EvoOne is a model that breaks the conventions of traditional portable products by designing the sound to be achieved for each material.

【Ultimate Sound Cannot Be Discussed by Ignoring Physical Differences: The Extremity Led by Optimized Dedicated PCBs for Each Material Type】
There are clear differences in conductivity, electromagnetic shielding, and mechanical properties between Cu and Ti. EvoAria recognizes that these differences affect the circuit's operating environment and ultimately manifest as distinct sound characteristics.
Therefore, instead of unifying the design specifications, EvoOne adopts a dedicated design tailored to the characteristics of each material, all under a common platform.
We offer two sound expressions that cater to different aesthetic sensibilities and preferences.

「Ti」
The goal of the Ti version was to combine precise signal transmission with high shielding, while leveraging the lightweight, high rigidity, and stable mechanical properties of titanium. EvoAria recognized that the physical properties of Ti have a unique impact on the circuit's operating environment, and based on this premise, the PCB layout was designed specifically for it. Aerospace-grade TC4 titanium alloy is used for the exterior. Through precise CNC machining and a high-quality PVD finish, this material, which boasts high strength, lightness, and long-term durability, is finished with a refined and sophisticated silver-white texture.
The internal circuit employs a 1-layer HDI board structure, with blind via technology to shorten power paths. A large area of continuous ground planes is secured within the multilayer board, and digital and analog signals are appropriately separated in the inner layers to suppress interference while supporting high signal purity.
Furthermore, the analog differential amplification circuit adopts a "perfectly isometric and proportional design." By meticulously routing all paths, from signal lines to power and ground, with perfect isometric and proportional lengths, phase distortion is completely suppressed. The Ti version is a specialized specification for achieving extremely stable signal transmission and precise expression within a lightweight and highly rigid housing. By incorporating the individuality of the material from the circuit design stage and eliminating phase distortion, the transparent and expansive sound characteristic of Ti is refined.

「Cu」
The aim of the Cu version was to actively integrate the high conductivity and electromagnetic shielding properties of copper-based materials into the circuit's operating environment itself, rather than merely treating them as an exterior texture. EvoAria recognized that the material characteristics of Cu offer unique advantages for signal flow and noise countermeasures, and accordingly, the PCB layout was specifically reconfigured on this premise.
High-purity brass with high conductivity and rigidity is used for the exterior. By functioning as both a robust structural body and a grounded electromagnetic shield, it forms a low-impedance path, supporting a stable reference potential.
The internal circuit adopts an 8-layer through-hole board, with optimized placement of ground vias. By forming a closed-loop structure that prevents noise currents originating from digital audio signals and clock signals from lingering on the board and instead guides them to the ground via the housing, interference from digital circuits to analog circuits is suppressed, supporting a low-noise and well-ordered signal environment. Furthermore, in the design of analog signals, impedance control through gold plating is adopted to fully utilize the extremely low impedance paths, thereby achieving extremely excellent dynamic response.
The Cu version is a specialized specification that utilizes the electrical properties of the material as part of the circuit, achieving a deeply silent background and unblemished dynamics. By directly incorporating the individuality of the material into the design, the sound characteristics unique to Cu are clearly delineated.

【Large Screen and Powerful Processing Performance Lay a Long-Term, Stable Foundation】
The EvoOne's main control platform utilizes an Android OS (DTA) dedicated to audio. This was necessary to ensure sufficient flexibility and room for the diversification of music playback environments, long-term use, and future evolution. It ensures usability such as the installation of most apps and screen rotation. Featuring the top-tier Qualcomm QCS8550 SoC, it comes equipped with 16GB of memory and 512GB of internal storage. Even with large 6-inch FHD+ (2160x1080) graphics, environments running multiple applications simultaneously, and operation scenes with high processing loads, the system always operates stably and smoothly. Its computing performance and ample system resources provide the audio system with an execution environment that maintains low load, high timing stability, and data integrity at all times, enabling clear and faithful sound reproduction. Furthermore, it includes a "Pure Music Mode" switching function to reduce the load on the audio system, achieving pure performance enhancement.

【Line Grill Structure Combining Heat Dissipation Performance with Usability】
For portable devices operating at high output, ensuring sufficient heat dissipation within a limited chassis size is essential. The line and grill structure on the sides of the EvoOne was designed to address this challenge. While providing a stable grip by conforming naturally to the hand, it also expands the effective heat dissipation area by approximately 27%, efficiently releasing heat even under high loads.
For the NuTube window, a restrained expression was adopted to avoid revealing too much of the internal components. When hybrid drive is activated, the glow of the vacuum tube can be faintly glimpsed through the side grill and openings, creating a visual experience unique to the EvoOne that balances both functionality and aesthetic design.
Internally, heat is efficiently transferred to the internal frame and external chassis via Panasonic-made graphene-based thermal conductive material. This supports the temperature environment required for stable operation of the Class A and Class AB discrete amplification circuits, and also ensures reliability during continuous use. Copper plates tend to feel hotter due to their high thermal conductivity, but both titanium and copper plates have undergone rigorous testing to ensure stable operation within safe operating temperature ranges. Heat dissipation design is not just about releasing heat; it is also a crucial foundation for enabling circuits to operate stably within appropriate temperature ranges and for refining the nuances of sound.

【Vacuum Tube-Specific Silicon Vibration Isolation Structure】
Vibration countermeasures are as crucial as circuit design when incorporating vacuum tube circuits into portable devices. This unit employs a vibration isolation structure that protects the entire vacuum tube stage by enveloping it in a dedicated silicon material. This suppresses microphonic effects caused by external vibrations, aiming to improve operational stability and signal purity, which is fundamental to delicate expression.

【Three-Dimensional Heat Dissipation Structure】
To maintain stable performance in a limited internal space, it is crucial to efficiently receive heat from each heat source and diffuse it evenly.
By adopting an aluminum alloy structural frame as the core of the heat dissipation system and combining it with graphite heat dissipation sheets, thermally conductive adhesive, and nickel-plated copper components, a highly efficient heat dissipation module is constructed. This three-dimensional heat dissipation structure enables rapid heat diffusion, optimizing the overall system's temperature balance. This significantly enhances cooling efficiency, ensuring long-term stable operation and maintaining unwavering high performance even in demanding playback environments.

【Triple Chamber Internal Structure】
Within a portable device, disparate elements such as power supply, amplification, and vacuum tube circuits coexist in high density. To achieve high playback quality, it is crucial not only to mount them in close proximity but also to suppress mutual interference. The EvoOne employs a triple chamber structure that separates the battery, vacuum tube circuit, and main circuit into independent compartments. By isolating interference factors at the hardware level, unwanted noise propagation is suppressed, and signal purity is enhanced.
This physical isolation design is not merely for reducing noise. By ensuring a quiet background while making it difficult for subtle signal rise and spatial depth to be obscured, it also plays a role in supporting the overall transparency of playback and the precision of expression. Polishing the quietness from the internal structure itself – that too is part of the perfection that the EvoOne aimed for.

【Diverse Digital Output Terminals】
EvoOne supports a variety of digital audio outputs, including USB Audio, S/PDIF, and I²S. USB Audio supports bi-directional transmission, and USB Audio output supports up to PCM768kHz and DSD512.

【High Expandability: Shared Line Out / Pre-Out Output】
The shared Line Out and Pre-Out design achieves both flexible connectivity and high signal purity. Switching between the triple analog audio architectures also allows for selection of preferred sound characteristics. It seamlessly integrates into a wide range of environments, from active speakers and power amplifiers to in-car audio systems. The 4.4mm PO ensures an output level of up to 6.4V at 200Ω. With a dynamic range and S/N ratio of 122dB, it delivers high-quality sound in any scenario, from desktop to mobile environments.

【Support for Wireless Environments】
EvoOne doesn't compromise on wireless communication either, in addition to wired connections. It supports Wi-Fi 7 and Bluetooth 5.3, and various codecs from UAT to SBC. With the HiByCast app, remote control is supported. You can control music file management, library browsing and searching, playback operations, and volume adjustment from your smartphone or tablet.

【Equipped with DC Mode: Consideration for Built-in Battery Lifespan】
It features a dedicated battery bypass function that considers the battery load during prolonged use. When an external DC power source, such as a PD charger, is connected and an input of 9V or higher is recognized, you can switch to DC Mode from the system screen.
When DC Mode is activated, the device is directly powered by the external power source without going through the battery. This design allows for stable continuous operation while reducing repeated charging and discharging, ensuring long-term battery protection and improved practicality, as well as a more stable playback environment.

【Dedicated leather case that combines functionality and luxury】
Made from carefully selected cowhide leather, it not only adds a touch of luxury but also provides a secure grip for the otherwise slippery metal body. The inside of the case is designed for efficient heat dissipation and features an ultra-soft microfiber material. This protects the device's titanium PVD coating and vintage copper finish from scratches when attaching or removing the case.

ファームウェアのご確認

製品がお手元に届きましたら、ご使用前にファームウェアがVer.1.2（2026年7月7日現在の最新版）になっていることをご確認ください。

アップデートは本体の［設定］→［システムアップデート］よりOTAで行えます。詳しい更新方法は「取扱説明書＆ファームウェア」リンク先のアップデート方法をご確認ください。

ソフトウェアに関するお知らせ

弊社では製品の品質向上のため、市場からのフィードバックを継続的に収集し、ファームウェアの改善および動作検証を行っております。現在確認されている既知の事象について以下のとおりご案内いたします。いずれも発生頻度は極めて低く、現在も原因の調査および改善を継続しております。

1. 起動直後のチャンネル出力について

電源投入後、ごく稀に左チャンネルから音が出ない、または左チャンネルの音量が右チャンネルより小さくなる場合があります。
本事象が発生した場合は、本体を再起動することで正常な状態に復帰します。

2. PO／LO切替時の出力レベルについて

PO（ヘッドホン出力）とLO（ライン出力）を繰り返し切り替えた際、Non-NFBモードでは、ごく稀に左チャンネルの出力レベルが右チャンネルより数dB高くなる場合があります。
なお、本事象はNFBモードでは発生しません。発生した場合はPOとLOを再度切り替えることで正常な状態に戻ります。

3. 再生中の瞬間的なノイズについて

音楽を連続再生中、ごく稀に「チッ」「ポッ」といった非常に短いノイズが発生する場合があります。現在のところ、音源ファイルの種類、ローカル再生/ストリーミング再生のいずれとも関係なく、発生条件の確認ができておりません。発生頻度にも一定の傾向はなく、数時間まったく発生しない場合もあれば、1時間の間に2〜3回発生する場合もあります。

今後も原因の解析および改善に向けた検証を継続し、進展があり次第ファームウェアアップデートなどを通じてご案内いたします。
お客様にはご不便をお掛けいたしますが、より良い製品をお届けできるよう、品質向上に努めてまいります。何卒ご理解賜りますようお願い申し上げます。

ご使用上の注意

《本体の発熱》
EvoOneは大電流駆動を前提とした設計のため、一般的なポータブルプレーヤーと比較して消費電力が高く、本体温度も高くなる場合があります。ご使用の際は、本体周囲に十分な放熱スペースを確保してください。別売りのスタンド「DS ONE」など放熱に優れた環境を推奨いたします。

また、ヘッドホンを接続した状態で音楽を再生しながら充電することはお控えください。本体温度が設定された保護温度に達した場合は、充電保護機能により充電を自動的に停止します。さらに、本体温度が保護温度の上限に達した場合は、安全性を最優先するため、再生も自動的に停止します。

《EvoOne Cuの外装仕上げについて》
EvoOne Cuの外装は、素材特有の質感や経年変化をお楽しみいただける仕上げとなっております。Cuモデルはその特性上、Tiモデルよりも傷が付きやすい傾向があります。日々の使用によるわずかな風合いの変化も含めて、ヴィンテージ仕上げならではの表情としてお楽しみ頂けたら幸いです。
表面には保護用のウレタンコーティングを施しておりますが、コーティング自体は比較的柔らかいため、傷や擦れを完全に防ぐものではございません。プラグや鍵などの硬い物との接触や、日常使用に伴う摩擦により、表面に細かな傷や跡が生じる場合があります。
お手入れの際は、アルコールシート、研磨剤、金属磨き剤などのご使用はお控えください。汚れや皮脂が気になる場合は、乾いた柔らかい布で優しく拭き取ってください。