Description
Full-discrete, Class-A, fully-balanced, the legendary headphone amplifier: S17 Pro in a new form: S17 Pro Evolution.Twin JFET, Class A, current adjustable, R2R volume
As Aune’s new generation of fully-discrete class-A headphone amp, the S17 Pro EVO has the features of twin JFET, R2R volume control, 2 levels of current to select from (A-L/A-H class-A quiescent current per transistor), output power as high as 7.5W, 3 groups of headphone outputs + 2 groups of preamp outputs, etc. It’s a high- performance rich-sounding headphone amplifier with high power.
S17 Pro EVO highlights
50W linear transformer
19200µF
JFET
Class-A amp
Bal max output
2 gain levels
2-levels current output mode
Preamp/headphone dual output mode
6.35mm/4.4mm 4-Pin XLR headphone output
4-inch display
S17 Pro VS S17 Pro EVO
S17 Pro
Total number of device components: 635
Switching between the output mode of the headphone amplifier/preamp: NO
Independent volume adjustment for headphone amplifier/preamp mode: NO
Automatic screen-off: NO
S17 Pro EVO
Total number of device components: 657
Allows independent selection to switch between headphone amplifier output or preamp output: YES
The current volume for headphone amplifier mode and preamp mode can be independently stored: YES
Option to enable or disable the automatic screen-off: YES
Twin JFET, tube-like sound
JFET has high input impedance and rich and mellow sound like the vacuum tube. As for the S17 Pro EVO, it’s not just JFET. It’s TWIN JFET, whose temperature rises are the same, performances are the same, and the mid-point voltage is stable. It is the ideal input transistor of a headphone amp.
Two pairs of transistors per channel, powerful
The S17 Pro EVO final output stage uses two pairs of output transistors in parallel. The whole device has as many as 16 output transistors. Max output is 7.5W. It can drive all kinds of headphones and IEMs with ease.
Class-A current adjustable, two levels
The S17 Pro EVO specially designed two levels of class-A current: A-L/ A-H per transistor, and each channel of the S17 Pro EVO has two pairs of transistors in parallel, so the quiescent current of each channel is as high as 100mA/ 200mA. The sound of a Class-A amp is mellow, warm and smooth.
Class A
A class-A amplifier’s output transistors remain conducting all the time whether there’s an input signal or not, and have the currents equal to the AC peak. The maximum AC signals flow to the load. The open-loop distortion is extremely low. Therefore, it’s regarded as the ideal amplifying circuit design.
The sound of the class-A amplifier is lush and full of details. Since the transistors perform in their most linear way; the Class-A amplifier barely has distortion. The listening experience is excellent.
R2R electronic volume chip: Precise and more
The S17 Pro EVO uses the R2R electronic volume chip from JRC and the dedicated op-amps to build the 4-ways balanced R2R volume control. High control precision, great channel balance, wide soundstage and accurate positioning.
Two colors to present current level and temperature, clear at a glance
The brand-new UI of the S17 Pro EVO uses two colors to present the current level and the temperature, making the display clear at a glance.
S17 Pro EVO A-H mode
A-H mode is a high current Class-A operation mode, similar to the GT mode in a racing car. There will be a slow temperature rise. (If the headphone impedance is low, it can lead to a faster temperature rise.) When the device temperature reaches 69°C, due to overheat protection, the S17 Pro EVO will auto switch to A-L Class-A current mode which still maintains very good sound quality.
Two gain levels drive your headphones and IEMs well and properly
The S17 Pro EVO has two gain levels, and has set different output amplitudes. The low gain takes advantage of the class-A amp’ S feature that the transistors are always working in the linear areas, to drive the IEMS well and properly, while the high gain is as high as 7.5W and thus can drive headphones well with big power.
32Ω load, single-ended output 2050mW, balanced output 7500mW
300Ω load, single-ended output 235mW, balanced output 918mW
600Ω load, single-ended output 117mW, balanced output 459mW
90Ω load, single-ended output 765mW, balanced output 2970mW
Complex cooler structure stable Class-A
The Class-A amp’s transistors are always working in the linear area, which causes a lot of heat. Aune’s industrial designer built a complex three-dimensional structure, making the heat sink on the transistor + heat plate at the bottom + chassis form a whole cooler system. And the heat goes out through the rear plate heat emission holes. The Class-A stability is thus guaranteed.
50W low-ripple toroidal transformer + 1920µF capacitor array enjoy the richness
The S17 Pro EVO uses the 50W low-ripple toroidal transformer and dual-poer design. Digital control and analog are independent from each other, so the analog part can be free from interference. What’ S more, it has the 19200uF capacitor array. They together make the S17 Pro EVO so powerful and rich-sounding.
Multi-function knob and all-aluminum remote, easy and fun to use
The front plate is clean and simplistic, and with the one multi-function knob you can adjust current, gain and volume. Let the listening be pure and easy.
The well-designed all aluminum remote makes the control even more enjoyable.
Multi-connectivity preamp outputs available
The S17 Pro EVO has 3 headphone outputs, 2 groups of preamp outputs and 2 line inputs, satisfying your needs in different scenarios.
The beauty of Arc and simplicity
The symbolic arc-shape design. Classic, simplistic, aesthetic. Enjoy music with the enjoyable design.
Rigorous HiFi component selection only for the sound
The components used for the S17 Pro EVO are high-quality ones that are carefully selected, such as the high-quality HiFi electrolytic capacitors, the ceramic capacitors, the organic thin-film capacitors, the communication-grade PCB, etc. Everything is aimed at good sound.
High-spec, the basis of excellent sound
Headphone amp output(high gain): 3.6µV; THD+N: 0.00024%. The excellent hardware performance has laid the solid foundation for excellent sound.
Aesthetic tuning
The tuning is based on real instrument sounds and music pieces referencing, leading to the signature that is natural and full of musicality.
Recommended pairing
S10N/S10 Pro Network music player + S17 Pro EVO headphone amp
Specification
Model: S17 Pro EVO
Size: 288mm x 211mm x 63mm
Gain low: 8.9dB
Gain high: 13.6dB
Input/output impedance
RCA input impedance: 10kΩ
RCA preamp output impedance: 200Ω
XLR input impedance: 10kΩ
XLR preamp output impedance: 100Ω
XLR/6.35mm/4.4mm headphone output impedance: 1Ω
Single-ended 6.35mm headphone output
Frequency response (20Hz-80KHz): ±0.05dB
THD+N: <0.0003%@1KHz
SNR: >115dB@600Ω
Crosstalk: <-105dB@1KHz 600Ω
Balanced XLR headphone output
Frequency response (20Hz-80KHz): ±0.05dB
THD+N: <0.00016%
SNR: >116dB@600Ω
Crosstalk: <-110dB@1KHz 600Ω
Single-ended output, G-L low gain
32Ω load: 5V, 780mW
100Ω load: 5.16V, 266mW
150Ω load: 5.16V, 177mW
200Ω load: 5.16V, 133mW
250Ω load: 5.16V, 106mW
300Ω load: 5.16V, 88mW
470Ω load: 5.16V, 56mW
600Ω load: 5.16V, 44mW
Single-ended output, G-H high gain
32Ω load: 8.1V, 2050mW
100Ω load: 8.3V, 688mW
150Ω load: 8.35V, 464mW
200Ω load: 8.35V, 348W
250Ω load: 8.4V, 282mW
300Ω load: 8.4V, 235mW
470Ω load: 8.4V,150mW
600Ω load: 8.4V, 117mW
Balanced output, G-H low gain
32Ω load: 9.6V, 2880mW
55Ω load: 9.85V, 1764mW
90Ω load: 10V, 765mW
100Ω load: 10V, 1000mW
150Ω load: 10.2V, 694mW
200Ω load: 10.2V, 520mW
250Ω load: 10.2V, 416mW
300Ω load: 10.2V, 347mW
470Ω load: 10.2V, 221mW
600Ω load: 10.2V, 173mW
Balanced output, G-H high gain
32Ω load: 15.5V, 7500mW
55Ω load: 16V, 4654mW
90Ω load: 16.35V, 2970mW
100Ω load: 16.35V, 2673mW
150Ω load: 16.6V, 1837mW
200Ω load: 16.6V, 1378mW
250Ω load: 16.6V, 1102mW
300Ω load: 16.6V, 918mW
470Ω load: 16.6V, 586mW
600Ω load: 16.6V, 459mW
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