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Esoteric Rubidium Master Clock Generator
Esoteric Rubidium Master Clock Generator 0
Esoteric Rubidium Master Clock Generator 1
Esoteric Rubidium Master Clock Generator 2

Esoteric Rubidium Master Clock Generator

Model #: G-01X
At a Glance
The high precision G-01X master clock generator adopts new technologies such as “Wide Range Clock Buffer Amplifiers”, “Adaptive Zero Ground” circuits, and a high precision rubidium oscillator to attain the very best in musical expression from your digital audio system.
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G-01X Master Clock Generator

  • Ultra high precision rubidium oscillator
  • Accuracy of + 0.00005 ppM
  • Adaptive Zero Ground circuit
  • Wide Range Clock Buffer Amplifier
  • 4 10 MHz master clock outputs
  • 2 independent 2-port outputs
  • Preheat Function for Processor

Master Clock Generator

A 'clock' is a pulse signal that is used as a reference signal for all digital circuits. Every piece of digital gear has an on-board clock oscillator, and a high-quality clock is vital for precise, jitter-free signal processing. The G-01X master clock generator is an external clock device designed to supply atomic precision clock to digital devices (such as a transport, D/A converter, Super Audio CD player, or network audio player) equipped with dedicated input terminals. The G-01X can supply clock signals with a significantly higher degree of purity and stability than clocks generated by connected devices themselves, and thereby significantly improves the sound quality.

Ultrahigh Precision Rubidium Oscillator Installed as the Heart of the Unit

An extremely high precision American-made rubidium oscillator with a frequency precision of ±0.05 ppb or ±0.00005 ppm is used as the core of this extraordinarily accurate timing device. This oscillator module has been manufactured to ESOTERIC’s demanding specifications with sound quality and stability being given top priority. The sound quality one would expect from a high end model has been achieved.

“Wide Range Clock Buffer Amplifier”

The “Wide Range Clock Buffer Amplifiers” developed for the Grandioso G1 flagship model are adopted to provide an even wider frequency range than ever before. These discrete circuits using high-speed transistors with excellent high frequency performance are separated for each output terminal to greatly contribute to major improvements in sound quality by providing an accurate and stable timing signal to audio devices.

"Adaptive Zero Ground" Mode

The G-01X has the “Adaptive Zero Ground” circuitry inherited from the Grandioso G1 between the internal rubidium unit 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 a separate power supply regulator assigned to each of the independent buffer amplifiers. The amplifier and power supply are divided into blocks to ensure drive that is both clean and powerful. A large toroidal transformer is used as the main transformer and a dedicated El core transformer is used for digital 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, which assists the accuracy of the clock’s signal generation.

Eight Outputs

The G-01X 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 × 2 and B × 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.

Useful Documents

Clock Outputs (Clock Out )

44.1 kHz setting44.1, 88.2, 176.4, 352.8, 705.6 kHz, 1.4112, 2.8224, 5.6448, 11.2896, 22.5792 MHz
48 kHz setting48, 96, 192, 384, 768 kHz, 1.536, 3.072, 6.144, 12.288, 24.576 MHz
Both settings100 kHz, 10 MHz
Connectors BNC ×4
Output level Rectangular wave: TTL level / 75 Ω


Out10 MHz
ConnectorsBNC ×4
Output levelSine wave : 0.5 ± 0.1 Vrms / 50 Ω

Master clock input (EXT IN)

Input frequency1pps mode: 1pps signal (GPS precision or better) / 10M mode: 10MHz (GPS precision or better)
ConnectorBNC x 1
Input levels10MHz: Sine wave: 0.5-1.0 Vrms/50 Ω Square wave: TTL level/10 kΩ and 1pps signal: Positive pulse: TTL level/10 kΩ

Rubidium Oscillator

Until oscillator stabilizes after power turned on10 minutes
Frequency stabilityWithin ±0.1 ppb (-20°C to +65°C)
Frequency precisionWithin ±0.05 ppb (when shipped new)(ppb = 10 -9)


Power supplyAC 230V, 50Hz , AC 120V, 60Hz , AC 220V, 60Hz
Dimensions (W x H x D) (including protrusions)445 x 131 x 359 mm (17 5/8″ x 5 1/4″ x 14 1/4″)
Weight13.3kg (29 3/8 lb)

Included Accessories

Power Cord1
Felt Pads3
Owner's Manual1
Warranty Card1

Misc. Specs

Product Weight (lbs.)29.38
Depth (in.)14.25
Width (in.)17.63
Height (in.)5.25
WarningProposition 65 Warning for California Residents