Esoteric G-02X OCXO Master Clock Generator


MSRP: €6500,00
(You save €300,00 )
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OCXO oscillator Clock+10MHz
Frequency stability:
Within ±0.15ppb
Frequency precision:
Within ±0.015ppb
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Master Clock Generator

The high precision G-02X master clock genenartor adopts new technologies such as "Wide Range Clock Buffer Amplifiers", "Adaptive Zero Ground" circuits, and anew custom made high-precision OCXO to attain the very best in muscial expression from your deigital audio system.


Ultrahigh Precision OCXO


* when shipped new

The core of the unit features a custom OCXO (Oven Controlled Crystal Oscillator) newly developed by ESOTERIC that is comprised of an oven that maintains a constant internal temperature, a crystal oscillator, and an oscillating circuit. This OCXO was designed for high audio quality based on the wisdom of the Grandioso series to provide an excellent center frequency precision (±0.01 ppm Typ), and reduces phase noise by approximately 3 dB* compared to previous model.
*Measured at an offset frequency of 100 Hz

"Wide Range Clock Buffer Amplifier"


The unit adopts the "Wide Range Clock Buffer Amplifiers" developed for the Grandioso G1. These discrete circuits utilize high-speed transistors with excellent performance at high frequencies and are separated for each output terminal to contribute to improved sound quality.

"Adaptive Zero Ground" Mode

The G-02X has the "Adaptive Zero Ground" circuitry inherited from the Grandioso G1 between the internal OCXO and the buffer amplifiers. The "Adaptive Zero Ground" mode actively drives the ground signal to 0 volts and greatly reduces noise (random jitter) caused by variation in the ground voltage. The user can select between the adaptive mode and the normal mode, for different sound characteristics according to their listening preferences.

Substantial Power Supply

A newly-designed power supply is adopted to maximize the performance of the new "Wide Range Clock Buffer Amplifiers", with the amplifier and power supply divided into blocks to ensure drive that is both clean and powerful. A toroidal transformer is used as the main transformer and a dedicated El core transformer is used for control. A series of multiple capacitors are used for the ripple filter circuit and Schottky barrier diodes are used for quick response to support fast digital processing.

Eight Outputs


The G-02X can supply a clock signal to a maximum of eight devices. Output can be switched ON and OFF for each terminal. The unit has four 10 MHz sine wave clock output terminals. The other four output terminals (A x 2 and B x 2) enable clock signals to be output at 100 kHz, 10 MHz (square wave), and the basic frequency of 44.1 kHz/48 kHz, up to a maximum frequency of 22.5792 MHz/24.576 MHz, and separate output frequencies can be set for each terminal.

Other functions

  • External 10 MHz Input for External Clocks
  • Milled Brass Gold Plated BNC Terminals
  • Preheat Function for Internal OCXO
  • Organic EL Display

Spec description

OCXO (Chrystal oscillator)  
Frequency stability Within ±0.015ppm (0°C to +70°C / 32°F to +158°F)
Frequency precision Within ±0.015ppm ((when shipped new)
Warm-up time 10 min. (Until oscillator stabilizes after power turned on)
Clock outputs  
Output level  
44.1kHz setting 44.1k, 88.2k, 176.4k, 352.8k, 705.6kHz
1.4112M, 2.8224M, 5.6448M, 11.2896M, 22.5792MHz
48kHz setting 48k, 96k, 192k, 384k, 768kHz
1.536M, 3.072M, 6.144M, 12.288M, 24.576MHz
Both settings 100kHz, 10MHz
10MHz OUT (BNC) 4
Output level Sine wave 0.5 ±0.1Vrms / 50Ω
Master clock input  
Input frequency 10MHz (within ±10ppm)
Input level  
Sine wave 0.5 to 1.0Vrms / 50Ω
Square wave TTL level / 10kΩ
Power supply  
  AC 230V, 50Hz
  AC 120V, 60Hz
  AC 220V, 60Hz
External dimensions (W×H×D) 445 × 107 × 359mm
17-⅝" × 4-¼" × 17-¼" (including protrusions)
Weight 11.3kg / 25 lb
Included accessories Power cord × 1
Felt pads × 3
Owner's manual × 1
Warranty card × 1


  • This product is available in three different power supply variations, as shown in the chart above. Make sure that the voltage shown on the rear panel matches the AC line voltage in your area.
  • The shape of the AC inlet and plug of the supplied power cord depends on the voltage rating and destination country.
  • Design and specification are subject to change without notice.
  • Weight and dimensions are approximate.

View product brochure.

Download english/french/spanish user manual.

Download german/italian user manual.

2 years

4 Reviews Hide Reviews Show Reviews

  • 5
    Esoteric G-02X Master Clock

    Posted by Anders, Sweden on 13th May 2021

    After plugging in the Master Clock I can just say "WOW", what a difference !!

  • 5
    Visual Grand Prix 2017 Summer Pure Audio

    Posted by Ongen Shuppan Publishing Co., Ltd on 28th Oct 2020

    Miscellaneous Accessories category

  • 5
    Visual Grand Prix 2018 Pure Audio

    Posted by Ongen Shuppan Publishing Co., Ltd on 28th Oct 2020

    D/A Converter category (Clock Generator sub JPY500k) Gold Prize

  • 5
    Audio Excellence Award 2018

    Posted by Ongen Shuppan Publishing Co., Ltd on 28th Oct 2020

    Extra Prize