Aune S17 Pro EVO: Balanced Class A Headphone Amplifier

Aune S17 Pro EVO is an innovative discrete Class A balanced headphone amplifier that also functions as a preamp. This amplifier offers robust amplification capabilities alongside a well-considered design, making it suitable for a diverse array of headphones ranging from 32 to 600 ohms.

The device features balanced outputs and incorporates an output stage that utilizes two parallel pairs of transistors for each channel, totaling 16 output transistors. With the integration of an R2R volume control, it ensures accurate signal level management and delivers a rich sound stage. Additionally, the independent volume control for both line and headphone outputs enhances user convenience, while an upgraded cooling system ensures reliable performance even during demanding conditions.

The front panel is equipped with a color display that presents details regarding volume, output type, current mode, and device temperature. It offers inputs through both balanced XLR connectors and unbalanced RCA connectors, facilitating the amplifier's integration into a range of Hi-Fi systems.

 

A meticulously engineered cooling system featuring internal radiators and a substantial metal plate efficiently dissipates heat, maintaining stable class A amplification. The power supply's integrity is ensured by a 50-watt toroidal transformer paired with capacitors totaling 19,200 μF, minimizing interference between the analog and digital components of the device.

The amplifier delivers a total output of 7.5 W at a 32-ohm load, enabling it to perform reliably with high-demand headphone models.

 

Aune S17 Pro EVO Specifications :

Device type:
Headphone amplifier
Preamplifier
Inputs:
1x RCA (unbalanced stereo)
1x XLR (balanced stereo)
Outputs:
1x 6.35 mm (unbalanced headphone output)
1x 4.4 mm (balanced headphone output)
1x 4-pin XLR (balanced headphone output)
1x RCA (unbalanced line output)
1x XLR (balanced line output)
Input/output impedance:
RCA input: 10 kOhm
RCA output: 200 ohms
XLR input: 10 kOhm
XLR output: 100 ohms
Headphone output: 1 ohm
Specifications for 6.35 mm output (unbalanced):
Frequency response: 20 Hz – 80 kHz (±0.05 dB)
THD+N: < 0.0003% @ 1 kHz
SNR: > 115 dB @ 600 Ohms
Crosstalk: -105 dB @ 1 kHz, 600 Ohms
XLR Balanced Output Specifications:
Frequency Response: 20 Hz – 80 kHz (±0.05 dB)
THD+N: < 0.00016% @ 1 kHz
SNR: > 116 dB @ 600 Ohms
Crosstalk: < -110 dB @ 1 kHz, 600 Ohms
Power Output at 6.35 mm (Low Gain):
32 Ohms: 738 mW
100 Ohms: 266 mW
150 Ohms: 177 mW
200 Ohms: 133 mW
250 Ohms: 106 mW
300 Ohms: 88 mW
470 Ohms: 56 mW
600 Ohm: 44 mW
Output Power at 4-pin XLR (Low Gain):
32 Ohm: 2880 mW
55 Ohm: 1764 mW
90 Ohm: 765 mW
100 Ohm: 1000 mW
150 Ohm: 694 mW
200 Ohm: 520 mW
250 Ohm: 416 mW
300 Ohm: 347 mW
470 Ohm: 221 mW
600 Ohm: 173 mW
Output Power at 6.35 mm (High Gain):
32 Ohm: 2050 mW
100 Ohm: 688 mW
150 Ohm: 464 mW
200 Ohm: 348 mW
250 Ohm: 282 mW
300 Ohm: 235 mW
470 Ohm: 150 mW
600 Ohm: 117 mW
Output power on 4-pin XLR (High Gain):
32 Ohm: 7500 mW
55 Ohm: 4654 mW
90 Ohm: 2970 mW
100 Ohm: 2673 mW
150 Ohm: 1837 mW
200 Ohm: 1378 mW
250 Ohm: 1102 mW
300 Ohm: 918 mW
470 Ohm: 586 mW
600 Ohm: 459 mW
General parameters:
Dimensions: 288 x 211 x 63 mm

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