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ESOTERIC G-01 Master Clock Generator
G-01 Master Clock Generator

Master clock generator equipped with ultra high precision rubidium oscillator Digital audio synchronized to one high precision master clock New support for 10 MHz and 22.5792 MHz master clock outputs
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G-01 Talk of flawless sound produced by an audio system connected together with a high precision master clock has been circulating between high-end audiophiles in various forms. As an example, the three dimensional effect of the sound stage gives the listener an actual feel of the high ceiling of a concert hall in addition to the width and depth of the original performance. The listener is treated to a pure and focused image of the playback sound that gives a sense of reality as if one could reach out and touch it. When the final note of the musical instrument fades away, you almost perceive the gradual silence like the color of a dark veil. This is truly an ultimate achievement of audio playback that "conveys music" so close to the original sound it leaves an unforgettable impression on the listener.

With the aim of enhancing the true potential of ESOTERIC digital players, the clock generator "G Series" was redesigned as a new generation of devices with improved functionality, power and flexibility.

The G-01 uses a high precision Rubidium oscillator with a frequency precision of ±0.05 ppb (parts per billion) or ±0.00005 ppm which provides optimum stability as an audio clock. This next generation clock generator supports master clock outputs of 10 MHz and 22.5792 MHz.

Master clock generator

Every digital audio device operates with an internal circuit generating the clock signals, or heartbeat, required to operate that device. This master generator is an extremely stable oscillator that supplies external clocks to digital devices (such as a transport, D/A convertor, Super Audio CD player) equipped with clock input terminals. The master clock generator supplies clock signals with a higher degree of purity and stability than clocks generated internally by digital devices and vastly improves the sound quality. By operating connected devices off the same highly stable master clock, timing errors called jitter are virtually eliminated greatly improving imaging and dimensionality while darkening the background.

Ultrahigh precision rubidium oscillator installed as the heart of the unit OCXO

An American-made rubidium oscillator with a frequency precision of ±0.05ppb=±0.00005 ppm is used as the core of this extraordinarily accurate timing device. This oven-controlled oscillator significantly improves the performance of the clock generator. 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 our best model in the master clock generator series has been achieved.

Newly-designed discrete clock output driver circuit configuration OCXO

G-01 has adopted a newly-designed discrete clock output driver circuit configuration. The circuit uses an ultra high-speed transistor that is optimal for generating digital waveforms for which ultrafast speed and a high degree of accuracy are required. Combined with a heavy-duty power supply, this circuit contributes to major improvements in sound quality by providing an accurate, stable timing signal to audio devices.

Power section with sufficient capacity Power section

The G-01 clock generator has a powerful power supply section that supports its basic performance. Three power supply circuit boards, a total of 15 power supply regulators, and independent power supplies for each circuit block have been installed to minimize mutual interference between circuit blocks and to supply clean energy to all parts. A large toroidal transformer, which enables highly efficient and high power actuation, is used as the main component in the power supply which is essential to the sound quality. An EI core transformer is used in the display section.

A series of multiple capacitors are used for a ripple filter circuit and Schottky barrier diodes are used for quick response supporting fast digital processing which assists the accuracy of the clock's signal generation.

10MHz clock and 22.5792MHz master clock outputs master clock outputs

G-01 can output a 10 MHz clock (sine wave or square wave) as well as 22.5792 and 24.576 MHz master clocks that are compatible with ESOTERIC's original "Direct Master Clock Link."

Three separate output systems Three separate output systems

G-01 can output 100 kHz and 10 MHz (sine wave) in addition to clock signals of 1x, 2x, 4x, and 512x multiples (22.5792 MHz/24.576 MHz) of the base frequency (44.1 kHz or 48 kHz) from three separate A/B/C output sections. Moreover, in frequency expansion mode (EXP), G-01 can output 8x, 16x, 32x, 64x, 128x, and 256x multiples of the clock frequency that enables it to supply clock signals to a wide range of devices, including professional audio or video equipment.

Each of these systems has two output ports supplying clock signals to a maximum of six devices. The output frequency can be set individually for each of the six ports from A1 to C2. If a single device is connected, all output ports other than the A1 port can be turned off. This feature has been added to avoid deterioration of sound quality occurring through unnecessary inter-component interference.

10 MHz sine wave clock outputs 10 MHz sine wave clock outputs

A 10 MHz square wave clock can be output from any of the output terminals of A, B, and C. In addition, two systems are designed specifically for devices equipped with 10 MHz sine wave requirements.

External 10 MHz/1pps input External 10 MHz/1pps input

A 10 MHz or 1 pps reference signal can also be input externally by connecting an ultra high precision external clock. In addition to the input reference signal mode, the new "Rubidium + external input" mode is also available.

When a GPS receiver is connected to an external input terminal and the "Rubidium + external input" mode is selected, the internal rubidium oscillator is synchronized with higher center frequency precision, and allows more stable clock signal output from rubidium oscillator than the crystal controlled oscillator built into the external GPS receiver, which makes the most of advantages of a high precision GPS system.

ESOTERIC's original gold-plated BNC ports

G-01 uses ESOTERIC's original BNC ports that provide highly reliable contact. These durable and secure ports can handle even the heaviest and thickest high-end cables.

Superb chassis construction for optimal performance

Since the oscillator is generally susceptible to vibrations, chassis construction has been designed with the utmost care. G-01 has an extraordinarily thick and highly-rigid aluminum chassis that minimizes the small vibrations that could affect clock precision.

Aesthetic rounded form

Thick aluminum material is used for the front, side and top panels, as well as the front corners. The G-01 chassis design has inherited the tradition of the rest of the ESOTERIC product line with screw-less rounded top and corners. The appearance of G-01 is in perfect harmony with ESOTERIC digital players.

The front panel, engraved with the ESOTERIC logo, is finished off with a refined short scratch proof material and gives off an aura of dignity as the main component controlling the entire operation of a digital reproduction system.

rounded form

Clock outputs CLOCK OUT 44.1 kHz setting 44.1, 88.2, 176.4, 352.8, 705.6 kHz
1.4112, 2.8224, 5.6448, 11.2896, 22.5792 MHz
48 kHz setting 48, 96, 192, 384, 768 kHz
1.536, 3.072, 6.144, 12.288, 24.576 MHz
Both settings 100 kHz, 10 MHz
Connectors BNC coaxial (75 Ω)
Output level Rectangular wave (TTL level / 75 Ω)
10MHz OUT 10 MHz
Connectors BNC coaxial (50 Ω)
Output level Sine wave : 0.5 ± 0.1 Vrms / 50 Ω
Master clock input Input frequency Rb+EXT1pps mode 1pps signal (GPS precision or better)
Rb+EXT10M mode 10MHz (GPS precision or better)
EXT 10M-IN mode 10 MHz (within ±10 ppm)
Connector BNC coaxial (50 Ω)
Input levels 10MHz Sine wave: 0.5-1.0 Vrms/50 Ω
Square wave:1.5-3.0 Vpp/50 Ω
1pps signal Positive pulse,TTL level/100 kΩ
Output clock
stabilization (approximate time
in minutes)
Until oscillator stabilizes after power turned on 10
PLL locking time 1
Frequency stability Within ±0.1 ppb (-20°C to +65°C)
Frequency precision Within ±0.05 ppb (when shipped new)
General Power supply AC 230V, 50Hz
AC 120V, 60Hz
AC 220V, 60Hz
Power consumption 85W (while warming up)
28 W (when stable)
(W x H x D)
(including protrusions)
445 x 131 x 360 mm
(17 1/2″x 5 1/8″x 14 1/8″)
Weight 13kg (28 1/2 lbs)
Included accessories Power cord x 1, Owner's manual x 1, Warranty card x1
- This product is available in three different power supply variations 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.

G-01 G-01 G-01

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