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.
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
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
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
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 El 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
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
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.
|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 Ohms)|
|Output level||Rectangular wave (TTL level / 75 Ohms)|
|10MHz OUT||10 MHz|
|Connectors||BNC coaxial (50 )|
|Output level||Sine wave : 0.5 ± 0.1 Vrms / 50|
|Master clock input|
|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 Ohms)|
|10MHz||Sine wave: 0.5–1.0 Vrms/50
Square wave:1.5–3.0 Vpp/50
|1pps signal||Positive pulse,TTL level/100 k|
|Output clock stabilization (approximate time in minutes)|
|Until oscillator stabilizes after power turned on||10|
|PLL locking time||1|
|1pps locking time||10|
|Frequency stability||Within ±0.1 ppb (-20°C to +65°C)|
|Frequency precision||Within ±0.05 ppb (when shipped new)|
|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)|
|Power cord x 1; Owner’s manual x 1; Warranty card x 1|