Class A Stable

Full-Discrete

Fully Symmetrical

Twin JFET

2 Transistors per channel

R2R Volume Control

50 Watt Linear Toroidal Transformer

Aluminium Remote Control

2 Amplifier Stages

Aune S17 Pro EVOHeadphone AmplifierFully Discrete, Class-A, Fully BalancedThe Legendary Headphone Amplifier: S17 Pro – Even Better – S17 Pro EvolutionTwin JFET – Class-A – Adjustable Current – R2R Volume ControlThe S17 Pro EVO is the new generation of aune's fully discrete Class-A headphone amplifiers with Twin JFET, R2R volume control, 2 selectable current levels (A-L/A-H Class-A quiescent current per transistor), up to 7.5 W output power, 3 groups of headphone outputs + 2 groups of preamplifier outputs, etc. It is a powerful headphone amplifier with the best sound and high performance.Twin JFETTube-Like SoundJFET has a high input impedance and a rich and smooth sound like a tube. The S17 Pro EVO is not just a JFET. It is a TWIN JFET whose temperature rise is the same, whose power is the same, and whose centre voltage is stable. It is the ideal input transistor for a headphone amplifier.Two Transistors per ChannelPowerfulThe power amplifier of the S17 Pro EVO works with two pairs of output transistors connected in parallel. The amplifier has a total of 16 output transistors. The maximum output power is 7.5 W. All types of headphones and IEMs can be operated without any problems.Class-A Current AdjustableTwo StagesThe S17 Pro EVO was specially developed for two-stage adjustment of the Class-A current: Each channel of the S17 Pro EVO has two pairs of transistors connected in parallel, so that the quiescent current per channel can be up to 100 mA/200 mA. The sound of a Class-A amplifier is soft, warm, and smooth.Class-AThe output transistors of a Class-A amplifier are always conductive, regardless of whether an input signal is present or not, and have currents that correspond to the AC peak current. The maximum AC signals flow to the load. The no-load distortion is extremely low. It is therefore considered an ideal amplifier circuit. The sound of the Class-A amplifier is rich and full of detail. As the transistors work very linearly, the Class-A amplifier has hardly any distortion. The listening experience is excellent.Electronic R2R Volume ChipPrecise, and MoreThe S17 Pro EVO utilises JRC's R2R electronic volume chip and associated operational amplifiers to create the 4-way balanced R2R volume control. High control precision, great channel balance, wide sound stage, accurate positioning.Two Colours for Displaying Level and TemperatureClear at a GlanceThe brand new user interface of the S17 Pro uses two colours to display the current level and temperature so that the display is clear at a glance.The A-H mode is a high-current Class-A mode, similar to the GT mode in a racing car. There is a slow increase in temperature. (If the impedance of the headphones is low, the temperature rise may be faster.) When the temperature of the device reaches 69°C, the S17 Pro EVO automatically switches to A-L Class-A power mode to avoid overheating while maintaining very good sound quality.Two Gain LevelsControl Your Headphones and IEMs Well and CorrectlyThe S17 Pro EVO has two gain settings, each with a different output level. The low gain utilises the Class-A amplifier's ability to keep the transistors in linear operation to drive IEMs well and properly, while the high gain is up to 7.5 W and can drive high-power headphones well.Complex Radiator StructureStable Class-AThe transistors of the Class-A amplifier always operate in the linear range, which generates a lot of heat. The industrial designer of aune has developed a complex three-dimensional structure in which the heat sink on the transistor, the heat plate at the bottom, and the housing form a whole cooling system. And the heat is dissipated through the heat dissipation openings of the rear plate. Class-A stability is therefore guaranteed.50 W Toroidal Transformer with Low Ripple + 19,200 μF Capacitor ArrayEnjoy the RichnessThe S17 Pro EVO uses a 50 W toroidal transformer with low ripple and a dual power design. The digital control and analogue are independent of each other, so the analogue part is free from interference. In addition, it has a 19,200 μF capacitor arrangement. Together they make the S17 Pro EVO so powerful and sonorous.Multifunction Button and Aluminium Remote ControlSimple and Convenient to UseThe front panel is sleek and simple, and you can adjust the power, gain, and volume with the one multifunction knob. This makes listening simple and straightforward.The well-designed all-aluminium remote control makes operation even more convenient.Multiple Connection OptionsPreamp Outputs AvailableThe S17 Pro EVO has 3 headphone outputs, 2 groups of preamp outputs, and 2 line inputs to meet your needs in different scenarios.The Beauty and Simplicity of the ArchThe iconic arched design. Classic, simple, aesthetic. Enjoy the music with the pleasant design.Strict Selection of Hi-Fi Components Only for the Sound

The components used for the S17 Pro EVO are of high quality and have been carefully selected, such as the high-quality hi-fi electrolytic capacitors, the ceramic capacitors, the organic thin-film capacitors, the communication-grade printed circuit board, etc. Everything is designed for good sound. Everything is designed for good sound.High-SpecThe Basis for Excellent SoundHeadphone amplifier output (high gain): 3.6 μV; THD+N: 0.00024%. The excellent hardware performance has created a solid foundation for excellent sound.