As Aune’s latest fully discrete Class-A headphone amplifier, the S17 Pro is engineered for high performance and rich, musical sound. It features a twin-JFET input stage, precision R2R volume control, and selectable Class-A bias with two current modes (50 mA / 100 mA per transistor). With up to 7.5 W of output power, three headphone outputs and two preamp outputs, it effortlessly drives everything from sensitive IEMs to demanding full-size headphones.
The twin-JFET design ensures matched thermal behavior, stable midpoint voltage, and consistent performance, delivering a smooth, tube-like tonal character with high input impedance—ideal for a reference headphone amplifier. The output stage employs 16 parallel output transistors, enabling massive current delivery and control. Each channel supports parallel transistor pairs, raising quiescent current to 100 mA / 200 mA, resulting in the hallmark warm, fluid, and natural Class-A sound.
For precise level control, the S17 Pro uses a JRC R2R electronic volume chip with dedicated op-amps in a fully balanced, four-way R2R architecture, providing excellent channel matching, wide soundstage, and pinpoint imaging. Dual gain settings optimize performance across use cases: low gain maintains linear Class-A operation for IEMs, while high gain unleashes the full 7.5 W output to power demanding headphones with ease.
Specifications – Aune S17 Pro
Product Type
- Headphone amplifier
- Preamplifier
Inputs
- 1 × Stereo RCA input
- 1 × Balanced stereo XLR input
Headphone Outputs
- 1 × 6.35 mm single-ended jack
- 1 × 4.4 mm balanced jack
- 1 × 4-pin balanced XLR
Line Outputs
- 1 × RCA line output
- 1 × XLR line output
Input / Output Impedance
- RCA input impedance: 10 kΩ
- RCA output impedance: 200 Ω
- XLR input impedance: 22 kΩ
- XLR output impedance: 100 Ω
- Headphone output impedance: 1 Ω
6.35 mm Headphone Output
- Frequency response: 20 Hz – 80 kHz (±5 dB)
- THD+N: < 0.00038% @ 1 kHz
- Signal-to-noise ratio: > 115 dB @ 600 Ω
- Crosstalk: < –105 dB @ 1 kHz / 600 Ω
Balanced XLR Headphone Output
- Frequency response: 20 Hz – 80 kHz (±5 dB)
- THD+N: < 0.00016% @ 1 kHz
- Signal-to-noise ratio: > 116 dB @ 600 Ω
- Crosstalk: < –110 dB @ 1 kHz / 600 Ω
Gain-Related Output Power
Low Gain (G-L) – 6.35 mm Output
- 738 mW @ 32 Ω
- 250 mW @ 100 Ω
- 166 mW @ 150 Ω
- 100 mW @ 250 Ω
- 83 mW @ 300 Ω
- 53 mW @ 470 Ω
- 41 mW @ 600 Ω
Low Gain (G-L) – Balanced Output
- 2773 mW @ 32 Ω
- 968 mW @ 100 Ω
- 645 mW @ 150 Ω
- 388 mW @ 250 Ω
- 333 mW @ 300 Ω
- 212 mW @ 470 Ω
- 166 mW @ 600 Ω
High Gain (G-H) – 6.35 mm Output
- 2020 mW @ 32 Ω
- 675 mW @ 100 Ω
- 453 mW @ 150 Ω
- 273 mW @ 250 Ω
- 228 mW @ 300 Ω
- 145 mW @ 470 Ω
- 114 mW @ 600 Ω
High Gain (G-H) – Balanced Output
- 7507 mW @ 32 Ω
- 2643 mW @ 100 Ω
- 1793 mW @ 150 Ω
- 1089 mW @ 250 Ω
- 908 mW @ 300 Ω
- 580 mW @ 470 Ω
- 453 mW @ 600 Ω
General
- Dimensions: 211 × 288 × 63 mm
- Color: Black
In the Box
- 1 × Aune S17 Pro headphone amplifier / preamplifier (Black)
- 1 × Power cable
- 1 × Remote control (CR1220 battery not included)
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