Master Sound TC* – Esoteric's Proprietary Temperature Control Program

Crystal frequency accuracy is affected by temperature. Therefore, temperature control is the most important factor in maintaining high clock accuracy. Esoteric’s proprietary “Master Sound TC” is a total temperature control system that maximizes crystal performance. We have developed not only the hardware but also the control software in-house to ensure that the Master Sound Discrete Clock delivers the highest possible performance. In a typical OCXO, crystals are stored in a hot oven and kept at a constant temperature. However, crystals differ in the temperature at which they are most stable. In our Master Sound TC system, the oven temperature is controlled by a program customized for each crystal to ensure that each crystal is always at the right temperature for stable performance. The result is an extremely natural and pure clock output with excellent musicality.

* TC = Thermo-Control

Four Independent Power Supplies for the Ultimate in Musicality

The Master Sound Discrete Clock, in which all circuits are discrete, also has four independent power rectification circuits for the oscillator circuit, buffer amplifier, heater, and control circuit. The power supply for the oscillator circuit and buffer amplifier uses a large toroidal power transformer to maintain the instantaneous power and purity of the clock signal. The power supply for the heater and control circuits uses a separate EI core transformer. By avoiding mutual interference between circuit blocks, high sound quality is achieved.

Esoteric-HCLD Output Buffer Circuit

The G-01XD is equipped with the highly acclaimed “Esoteric-HCLD” output buffer amplifier circuit originally designed for the Grandioso C1X preamplifier. It takes advantage of its powerful current transfer capability and 180MHz wide frequency response to deliver pure 10MHz sine wave clock signal to connected digital players.

Four 10MHz Sine Wave Clock Outputs Compatible with ‘Adaptive Zero Ground’ Mode

The G-01XD is equipped with four 10 MHz sine wave clock output terminals. A toggle switch provided for each terminal allows you to switch between "normal mode" and “Adaptive Zero Ground mode”, in which the ground level for each output terminal is always driven to 0 V, the reference potential of the signal, allowing you to choose the sound quality you prefer.

A Custom Designed Coaxial Cable with MIL-standard SMA connectors

A special custom coaxial cable, carefully selected for sound quality, is used for the critical wiring inside the G-01XD. The connectors are gold-plated SMA connectors that comply with MIL standards. The output connectors are gold-plated BNC connectors with precisely matched impedance = 50Ω to increase transmission reliability and reduce loss.

Unique Chassis Construction

The chassis construction is also specially designed for vibration-sensitive master clocks. The front and side panels are made of heavy-duty, thick-walled aluminum to suppress external vibrations. The Master Sound Discrete Clock module inside the chassis is freely mounted and mechanically grounded by its own weight without the use of mounting screws. Esoteric’s unique Pinpoint Foot System (Patent No. 4075477, No. 3778108) does not use screws to attach the foot base to the lower chassis, but is held in place by the weight of the chassis when installed. By eliminating as many screws as possible to reduce stress concentration on these vibration-sensitive components, a natural vibration damping effect can be achieved, resulting in superior sound quality. In addition, the top plate has a semi-floating structure that is not fixed with screws, resulting in an open sound.