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AUNE S18 EVO DAC Black
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Aune S18 EVO DAC 2x AK4497 XMOS Bluetooth aptX HD LDAC 32bit 768kHz DSD512 Black
The Aune S18 EVO is a DAC designed to ensure accurate reproduction of digital audio streams, utilising a dual-chip AK4497 architecture combined with global clock synchronisation. It achieves a distortion level of -116 dB and an output noise of 2.6 µV, utilising centralised clock management via PLL to stabilise the timing signal prior to conversion.
Designed for integration into high-end Hi-Fi systems, it combines multi-input processing, signal conditioning and full synchronisation, ensuring consistent sound quality regardless of the source. This approach enables it to act as a central conversion unit, whilst maintaining constant temporal coherence and analogue stability.
Aune S18 EVO: DAC AK4497
The S18 EVO features two AK4497 DACs operating in mirror mode, enabling precise alignment of the left and right channels whilst reducing phase differences between them. This balance is further enhanced by a direct IIS transmission architecture to the conversion stages, thereby avoiding intermediate conversions that could introduce jitter or synchronisation errors.
Beyond the physical topology, the entire digital signal path is synchronised to a common time reference, ensuring that each sample is processed using a consistent clock reference. This approach results in a more stable reconstruction of the analogue signal, which is particularly noticeable in terms of spatialisation and the precision of subtle details.
Aune S18 EVO: Third-generation PLL
The system is based on a third-generation phase-locked loop, which dynamically synchronises the incoming and internal clocks to correct timing discrepancies between signals. This comprehensive synchronisation relies on a 10 MHz external clock, providing a stable reference across the entire conversion circuit.
By reducing jitter to levels in the order of femtoseconds, the system ensures a consistent time base for all digital processing. This stabilisation extends throughout the entire internal signal chain, thereby minimising signal interpretation errors during critical conversion stages.
Aune S18 EVO: Unified signal processing
The various digital inputs – whether USB via the XMOS XU316 interface or AES, coaxial and optical streams – are systematically reprocessed prior to conversion, thereby eliminating any irregularities associated with the sources. This processing includes conversion to the IIS format as well as signal isolation, which limits the propagation of electrical interference between stages.
This approach is extended to Bluetooth, whose signal is also resynchronised via a PLL before being transmitted to the DAC, thereby reducing the jitter typically associated with wireless transmissions. Compatibility with high-definition codecs allows this processing logic to be extended to wireless applications, whilst maintaining consistency in sound reproduction between wired and wireless sources.
Aune S18 EVO: Audiophile-grade construction
The S18 EVO utilises a selection of passive components and connectors from specialist manufacturers, ensuring electrical stability across all critical stages. Capacitors, resistors and printed circuit boards are therefore designed to minimise background noise and maintain signal integrity over time.
This rigorous design approach is reflected in measured performance figures of 2.6 µV output noise and a THD+N of -116 dB, indicating low distortion and good resolution of low-amplitude signals. These results confirm the device’s ability to preserve dynamic range and subtle details in real-world listening conditions.
Aune S18 EVO: Interface and system integration
The interface features a front-panel display showing key playback settings, whilst the aluminium remote control allows for remote operation with intuitive controls. This design prioritises simplified interaction, reducing the number of steps required when changing the source or volume.
For those integrating the S18 EVO into a complete audio system, this user-friendly design, combined with its reliable performance, ensures a seamless everyday experience whilst maintaining precise control over the audio system’s key functions.
Technical characteristics
| Specifications | |
|---|---|
| Product type | DAC |
| Inputs | 1x USB-B 1x Optical Toslink 1x AES/EBU 1x Coaxial 1x BNC (Clock) Bluetooth |
| Output | 1x Balanced stereo XLR 1x Single-ended stereo RCA |
| Supported sampling rates | USB: PCM up to 32bit 768kHz, DSD up to DSD512 Coaxial / AES / Optical: PCM up to 24bit 192kHz Bluetooth: PCM up to 24bit 192kHz |
| Total harmonic distortion more noise (THD+N) | XLR: 0.00022% RCA: 0.00029% |
| Background noise | XLR: 4.07µV RCA: 2.04µV |
| Dynamic range | 122dB |
| Maximum output level | XLR: 4.9Vrms RCA: 2.2Vrms |
| General | |
|---|---|
| Dimensions | 211 x 288 x 63mm |
| Color | Black |
| Package | 1x Aune S18 EVO 1x Power cable 1x USB cable 1x Remote control |
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