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Sforzato PMC−005EX Reference Master Clock

MSRP: $24,000


10 MHz sine wave
Output Impedance
50 Ω
Output Terminal
1 BNC terminal
Output Level
7 dBm
390 (W) x 327 (D) x 106 (H) mm
10.5 kg

PMC−005EX is a 10 MHz master clock with an ultra‐low phase noise rubidium oscillator. The appeal of the rubidium clock sound lies in its Hi-Fi feel. Sound image and localization, which allows you to grasp the outline of all sound, are clear when connected. However, sometimes an overkill and artificial sound field expression can be heard.

Normal rubidium oscillators have excellent absolute accuracy and long‐term stability. However, the characteristics of near‐phase noise, which affects jitter, are inferior to those of a good crystal oscillator.

PMC−005EX is the ultimate master clock that combines this Hi‐Fi feeling with a natural sound field expression by utilizing a rubidium oscillator with ultra‐low phase noise.

Master clock that determines sound quality

All digital audio equipment such as network players, D/A converters, and CD players operate on the clock generated by the internal clock generator. When a digital signal is converted to an audio signal, it operates based on this clock, so the quality of the clock greatly affects the sound quality. The Sforzato master clock generator supplies a much higher quality clock than the built‐in clock of the device, and contributes to a dramatic improvement in sound quality.

Minimal near phase noise (−113 dBc/Hz at 1 Hz)

The rubidium transmitter of PMC−005EX is a transmitter with the ultimate near‐phase noise characteristics. The rubidium oscillator used in ordinary measuring instruments is about −70 dBc, and the rubidium oscillator made in the United States used by major audio manufacturers is about −100 dBc. Such oscillators have extremely low phase noise. It is the ultimate clock for enjoying music that has both the Hi‐Fi feeling and the air feeling brought about by the ultra‐low near phase noise.

Power supply with a margin

The clock is equipped with a large, generous, discrete analog power supply that uses a large‐capacity toroidal transformer and an ultra‐high‐speed, ultra‐low‐noise SiC Schottky diode to maximize the performance of the transmitter.

Robust housing

Unnecessary vibration and external noise are thoroughly suppressed by a robust housing with a 15 mm thick front panel carved from an aluminum block and a 3 mm thick aluminum body. The clock oscillator has a structure that floats from the housing and does not transmit vibration.

Discerning internal wiring and output terminals

With the cooperation of Sekiguchi Machinery Sales Co., Ltd. (Acoustic Revive), the internal wiring uses an elliptical single‐wire PC‐triple C wire. The purity of the power supply and signal is ensured by using a laborious wiring method that does not use a connector as much as possible. Moreover, the rigid cable that cannot be re-bent, which shields the copper tube, is used for the wiring of the clock output.