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Usually audiophiles examine the pros and cons of a CD turntable or USB/DAC, and evaluate it from the structure of the turntable and the DAC circuit. But the real Hi End signal source must take into account the time base error(Jitter)With clock oscillator(oscillator)Accuracy. Where does the time base error come from? The most important thing is that the music signal is sent to the DAC section. When the DAC chip is doing digital conversion, the quality of the music signal(Sampling rate, distortion rate)It is determined by the DAC, but for the time axis, the DAC must follow the clock oscillator built into the host. Generally speaking, the higher the accuracy of the clock oscillator, the better, but it is very susceptible to electromagnetic and vibration interference. Therefore, Hi End brands often set up an independent clock generator to replace CD turntables or USB DACs. Built-in clock circuit. In this regard, Esoteric is already recognized as a leader in this regard.
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G-02X is Esoteric’s new clock generator, G-02(Launched in 2012)An upgraded version of.
The appearance of G-02X and G-02 is almost the same, except for the model on the front panel and the back panel. On the DM provided by the original factory, the four lines of green text directly indicate the three characteristics of G-02X: the use of "Wide Range Clock Buffer" Amplifiers"(High bandwidth clock buffer amplifier circuit), "Adaptive Zero Ground circuits"(Zero potential ground loop), And the new process OCXO
Oscillator controlled quartz crystal oscillator (Oven Controlled Crystal Oscillator ). The first two items are inherited from the clock G-01(A new generation of G-01X is now available)Technology. Simply put, the internal materials of G-02X are based on the model, and even the power supply has been upgraded. Therefore, the accuracy of the buffer amplifier circuit is higher than that of the G-02, which is more conducive to the stability of the active output clock signal; the grounding part, G -02X has Adaptive(Recommended to apply)With Normal(general)Two grounding modes, of course, the former has a better grounding effect(Or different personalities), Can get rid of circuit noise.
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The G-02X''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s backplane terminal has eight sets of clock output, two more than G-02, and all eight sets can be individually set on and off. The four BNC terminals on the left half of which are marked with 10MHz Out output a 10MHz sine wave, and the other four groups are 100kHz to 10MHz square waves.
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This is the internal diagram of G-02X. In the past, the clock oscillator and output circuit of G-02 were installed on the same circuit board, but G-02X has been separated.
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Finally, let’s talk about the third most important OCXO. This kind of quartz oscillator is the same one used in G-02. However, I have specially compared the specifications and found that the frequency stability of G-02X is ±0.015ppm(parts per million), It is 0.005ppm higher than the oscillator on the G-02, and the adaptable temperature range is also narrow. G-02X is 0 degrees to 70 degrees, and G-02 can be as low as -20 degrees. The frequency accuracy of both models is the same as ±0.01ppm. This small difference may be due to cost considerations, but overall, G-02X is still much superior in terms of materials and technology.
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This is the OCXO oscillator used by the G-02. It has a slightly higher volume and is built on the same block as the output circuit.
specification:
Power supply: 100V AC 50-60Hz
Power consumption: 18W(run), 12W(Standby)
size(Wide× high× deep):445mm×107mm×359mm
Weight: 11.3KG
Including accessories: power cord x 1, felt pad x 3, user manual x 1, warranty card x 1