Aune SC1 EVO clock (sound clock)

Aune SC1 Evo is an advanced external audio clock designed to deliver high stability and low-jitter clock signals to digital audio devices, improving sound quality in hi-fi systems. As an evolution of the popular SC1 model, it combines a custom OCXO oscillator with innovative power supply and an intuitive user interface for real-time monitoring. The product is developed in collaboration with Titans Audio Lab and fine-tuned for Aune's unique sound signature, making it ideal for audiophiles who want to optimize the performance of their system. This audio clock acts as a "conductor" for your hi-fi system, reducing jitter and phase noise for a cleaner, more transparent sound experience.

Custom OCXO oscillator: An oven-controlled crystal oscillator (OCXO) developed by Titans Audio Lab, optimized for audio applications. It offers extremely low jitter (<100 fs) and high frequency stability, surpassing common oscillators by covering a wider frequency range (1 Hz–1 MHz).
Dual waveforms and outputs: Two 10 MHz sine wave outputs and two 10 MHz square wave outputs, which can be used simultaneously. This provides flexibility to connect multiple devices, with phase synchronization under 0.00001° for isolated outputs. Sine waves provide a smoother character, while square waves offer a more distinct sound profile.
Clear UI interface: A full-color display showing real-time temperature in the oscillator's core chamber. The status indicator changes color: red during warm-up (no output), yellow when operational, and green at optimal performance. This ensures the user always knows when the clock is ready for best results.
Advanced power supply: Cascaded symmetrical low-noise design with step-by-step voltage regulation. Integrates ESS's second-generation DAC-specific linear power supply with 80 dB PSRR and ultra-low output noise of 1 μV. Supports both AC (100–240 V) and DC (9 V 2 A) input, including compatibility with linear power supplies or lithium batteries for portable use.
Low noise and isolation: A dedicated low-noise, high-current LDO (Low Dropout Regulator) for OCXO power supply, combined with shielding to minimize interference. The result is a clean, transparent sound with a dark background.

Specification:

• Output frequency: 10 MHz (4 outputs: 2x sine wave, 2x square wave)
  
• Output power: >5 dBm (50 Ω); Square wave ≥9 dBm, Sine wave ≥5 dBm                       
  
• Jitter: <100 fs (1 Hz–1 MHz)
  
• Phase noise: -110 dBc/Hz @ 1 Hz; -145 dBc/Hz @ 10 kHz
  
• Frequency stability: <100 ppb (total); <0.01 ppb (short term); Accuracy: ±50 ppb     
  
• Output impedance: 50 Ω
  
• Warm-up time: Approx. 10 minutes (basic)
  
• Power supply: AC: 100–240 V; DC: 9 V 2 A
  
• Operating temperature: Normal: 0–50 °C; Optimal: 15–35 °C
  
• Dimensions: 288 x 211 x 63 mm (W x H x D)
  
• Weight: 2 kg
  
• Connections: BNC cables (50 Ω or 75 Ω recommended)

Compatibility:
The product is compatible with devices that have a 10 MHz clock input, such as Aune's own models (e.g., S9c Pro, S10N, S10 Pro). Use BNC cables for connection and enable external clock in the device settings. It works with both 50 Ω and 75 Ω impedance cables.