AURALiC LEO GX Reference Master Clock - Premium

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" I don’t know how much better digital audio decoding can get. Auralic has achieved a new level of performance with the VEGA G2 DAC and LEO GX MASTER CLOCK. The distortion is so low, it is reaching the limits of my Audio Precision spectrum analyzer. Jitter, which is an important issue to be dealt with, is dealt with superbly."
- Secrets of Home Theatre & HiFi - 5 Stars
" What LEO GX does is not something I’ve encountered with digital audio before: it makes the sound ‘pop’ out of the loudspeakers!"
- Hi-Fi+ ~ Jason Kennedy - 5 Stars
Stock code: AURLEOGX


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    Product Information

    LEO GX is a breakthrough in digital audio system clocking — the first master clock ever that can feed a DAC directly with a working signal so precise Auralic had to use new benchmarks to measure its performance. Wider staging, pinpoint locational accuracy, and an expanded dynamic range are just some of the benefits you’ll hear when you implement LEO GX’s one-of-a-kind approach to clocking that literally bypasses the traditional limitations of internal DAC clocks.

    A Breakthrough in Digital System Clocking
    As digital music formats and system components march ever forward in quality and capabilities, high-end audio systems increasingly rely on the precision of their clocks to keep the digital realm in order. The greater dynamic range of high resolution files for example is only realized with the help of modern clocks that are capable of working frequencies nearly ten times higher than what was common just a handful of years ago. However, today’s high-frequency DAC clocks are costlier and much harder to design and build than ever before.

    Traditional Clocking
    Normally, phase-locked loop circuits (PLL) in a DAC are used to synchronize its internal working signal with the more accurate incoming signal from a reference clock. But they’re noisy. And even though the working signal can be nudged a bit to match up with the reference signal, its frequency — and the precision of the analog waveform that’s based on it — is ultimately limited by the DAC’s own clock circuit.

    Direct-to-DAC Design
    Thanks to its unique Jitter-Free Operation, when the VEGA G2 joins forces with the LEO GX these devices accomplish something extraordinary. Instead of merely synchronizing with the LEO GX, the VEGA G2 actually uses the exceptionally high frequency incoming clock from the LEO GX directly — as its own working signal. In other words the LEO GX bypasses the internal VEGA G2 clock circuit entirely, and drives waveform creation directly with its signal. No more PLL, and no more limitations.

    A New Description of Performance
    The LEO GX clock is so precise that existing benchmarks aren’t detailed enough to accurately represent what it can do. Instead, we use Allan deviation to describe the resolution of the LEO GX, which is like looking at phase noise closely enough to detect shifts of +/-1Hz or even +/-0.1Hz. The Allan deviation of the LEO GX Reference Master Clock comes in at 2E-12 (at 1 second), which is equal to a 10MHz rubidium atomic clock with phase noise of +/-1Hz at -110dBc/Hz, or an amazing 500 times less jitter than an 82fs Femto clock oscillator.

    Clock Structure
    LEO GX hardware starts with two temperature-controlled rubidium atomic reference clocks. Each is paired with an oscillator using stress compensated cut crystals, for thermal and mechanical resilience and low phase noise performance. The result is the LEO GX’s remarkably high signal frequencies: 90.316MHz for 44.1-based audio signals, and 98.304MHz for 48K-based signals.

    Optical Isolation
    We’ve gone to great lengths to reduce interference and noise in the new LEO GX, including the use of optical isolation techniques that keep systems physically separated from each other. Control signals from the processing circuit are sent to the clock circuit via fiber optic cables instead of electrical pathways, so the source of LEO GX’s impeccable timing is never disturbed.

    Unity Chassis
    Designed specifically for the premium lineup of AURALiC G Series devices, the Unity Chassis is machined from a single billet of aluminum that provides the LEO GX with superior shielding from EMI noise. It’s the perfect working environment to create the ultra-precise, high frequency feed that can take the performance of your G system to new heights.

    Perfectly Balanced
    LEO GX internal circuits are physically distributed to enhance overall balance and performance. And its specially designed foot spikes dampen and absorb vibrations so the operation of its internal clock always starts with a rock-steady foundation.

    Dual Purer-Power Linear Power Supplies
    We’ve given the LEO GX two of our ultra-quiet Purer-Power linear power supplies, galvanically isolating them from each other in the obsessive quest to reduce noise and create a pristine working environment. One Purer-Power supply feeds the LEO GX’s processing system, while the second powers the clock circuit. Interference between the areas is reduced to minimum, so there’s nothing to get in the way of LEO GX’s stellar performance.

    Realize Full Potential
    The LEO GX is such a precise clock, running at very high frequency, you will need the best interconnect cable to realize its full potential. We created a cable specifically for LEO GX, made from 60GHz bandwidth military aerospace-grade material and connectors. Handmade and precisely tuned, it comes with a performance data report so you can be sure its specs are well capable of the task at hand.

    Technical Specifications

    BENCHMARK
    Allan Deviation: 2E-12 (1 second)
    Equivalent Jitter: 500 times less than an 82fs femto clock (1Hz-10Hz)
    Equivalent Phase Noise: -110dBc/Hz@1Hz (Ref Frequency: 10MHz)

    THE CLOCK
    Frequency: 90.3168MHz (44.1KHz) | 98.3040MHz (48KHz)
    Output Level: 3.3V CMOS (Direct-to-DAC Design)
    Reference: Temperature-controlled Rubidium atomic clock
    Oscillator: Temperature-controlled SC cut crystal

    SAMPLING RATE
    PCM: 44.1KHz to 384KHz in 32Bit
    DSD: DSD64(2.8224MHz), DSD128(5.6448MHz), DSD256(11.2896MHz)

    SYSTEM CONTROL
    Switch sampling rate automatically via Lightning-Link with G2 DAC

    POWER SUPPLY
    Dual Purer-Power internal linear power supply
    10uV low noise designed for audio circuits

    NOISE ELIMINATION
    Optical isolation between control and clock circuits
    EMI-shielding Unity Chassis

    NETWORK
    Gigabit Ethernet (For firmware upgrade use)

    POWER CONSUMPTION
    Warmup: 30W at maxbr/> Running: 15W

    Dimensions - W x D x H
    13.4 x 12.6 x 3.2 in. (34cm x 32cm x 8cm)

    WEIGHT
    17.8 lbs (8.1kg)

    PRODUCT FINISHING
    Anodized precision-machined extrusion aluminum case in matte black

    Contents
    AURALiC LEO GX Reference Master Clock
    Hex wrench (for use of tighten clock cable)
    Users's guide
    Power cord
    Lightning-Link cable
    Basic version: High quality RF clock cable
    Premium version: 60GHz aerospace grade clock cables

    Manufacturer site

    "What LEO GX does is not something I’ve encountered with digital audio before: it makes the sound ‘pop’ out of the loudspeakers!”
    ~ Hi-Fi+/Jason Kennedy

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