Grandioso G1

The Grandioso G1 is the flagship model of master clock generator line, which combines all of our wisdom, technology, and passion.


1 year warranty

Finance example

£4,600.00 initial 20% deposit then £613.33 per month for 30 months. Other finance terms available. Finance subject to status

Grandioso G1


A truly three-dimensional audio experience delights the listener with a real sense of depth and conveys the actual feel of the high ceiling of a concert hall. High-end audiophiles know the excitement felt at the moment the first sound shatters the silence, the tense experience of impeccably tight focus, and the joy of music that feels so real you can almost touch it. After the last beautiful gradation of a lingering note has gently faded away and the system has concluded playback is when the true thrill of music really begins.

The role of a high precision master clock is not to add something extra to your audio system. Rather, it is to attain the maximum performance from the system in order to convey music that is as close as possible to the original sound. The Grandioso G1 is the flagship model of master clock generator line, which combines all of our wisdom, technology, and passion. It adopts a high precision rubidium oscillator with a frequency precision of ±0.05 ppb (parts per billion) or ±0.00005 ppm and new technologies such as “Wide Range Clock Buffer Amplifiers” and “Adaptive Zero Ground” circuits to attain the very best in musical expression from your favorite audio system.

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 Grandioso G1 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 G1 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
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 our best model in the master clock generator series has been achieved.

“Wide Range Clock Buffer Amplifier”
The clock signal is output by four newly-designed “Wide Range Clock Buffer Amplifiers”, which each have a separate power supply regulator and provide an even wider range than ever before. The discrete circuits use high-speed transistors with excellent high frequency performance, which are perfect for generating digital waveforms for which a high degree of accuracy is required. Combined with a heavy-duty power supply, these circuits greatly contribute to major improvements in sound quality by providing an accurate and stable timing signal to audio devices.

Four 10 MHz Clock Output Terminals and “Adaptive Zero Ground” Mode
The unit provides four terminals that output a 10 MHz sine wave clock, and is equipped with a new “Adaptive Zero Ground” mode that actively drives the ground signal to 0 volts. This greatly reduces noise (random jitter) caused by variation in the ground voltage. Switches on the rear of the unit toggle between the adaptive mode and normal mode for each output terminal, and allow the user to select the buffer amplifier drive method that is just right for their listening preferences.

Preheat Function
The rear of the unit features a switch that toggles between the mode that completely shuts down the system when the power is turned OFF, and the recommended preheat mode, which continues to supply power to the internal rubidium oscillator. Keeping the rubidium warm reduces waiting time after the power is turned ON and enables the unit to provide its full performance immediately.

Superb Chassis Construction for Optimal Performance
Since the high precision nature of the rubidium oscillator makes it delicate and susceptible to external vibrations, special consideration has been made in the chassis construction to control these vibrations. The bottom chassis securing the various components adopts a dual layer structure comprised of two steel plates, and the power transformer and other components are affixed to separate layers in a three-dimensional configuration to prevent interference between neighboring components. Furthermore, the unit features an extraordinarily thick and highly-rigid aluminum panel enclosure and patented ESOTERIC pin point feet (patent no. 40750477 JP) that minimize the small vibrations that could affect clock precision.

Tech spec

Clock Outputs




Master Clock Input



Frequency stability

Within ±0.1 ppb (-20°C to +65°C)

Frequency precision

Within ±0.05 ppb (when shipped new)

External dimensions (W x H x D, including protrusions)

445 x 132 x 448 mm (17 5/8″ x 5 1/4″ x 17 3/4″)


23 kg (50 3/4 lb)

For more information click here to visit the Esoteric website


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