NADAC C

Ultra-Low-Noise Master Clock

The Ultimate Reference for Absolute Digital Precision

When Every Nanosecond Matters. Digital audio has reached an extraordinary level of sophistication. Today's finest converters, streamers and digital transports are capable of resolving breathtaking amounts of musical information, yet their ultimate performance depends upon one often overlooked parameter: time. Not simply the passing of seconds, but the astonishingly precise timing that governs every digital sample.

A deviation measured in mere trillionths of a second is enough to alter harmonic structure, diminish spatial realism and reduce the emotional impact of a performance. Even the most advanced DAC cannot reconstruct music perfectly if the timing reference that governs its operation is compromised. The Master Fidelity NADAC C Master Clock has been created to solve this challenge with uncompromising precision.

Rather than functioning as an accessory, the NADAC C establishes an exceptionally stable temporal foundation upon which an entire digital playback system can perform. By supplying an ultra-low phase noise 10 MHz master reference, it enables compatible components to operate with extraordinary synchronisation, dramatically reducing timing errors that subtly obscure musical realism. The result is not merely improved measurements - it is a profound transformation in the way music is experienced.

The Philosophy of Perfect Timing

Master Fidelity approaches digital audio differently, where many manufacturers focus on increasing resolution or processing power, Master Fidelity recognises that the true fidelity of digital playback depends equally upon timing integrity. Every digital sample must arrive at precisely the correct instant. If those moments shift - even by unimaginably small amounts - the reconstructed analogue waveform changes.

The phenomenon is known as jitter, but its audible consequences extend far beyond conventional technical definitions. Timing instability reduces image focus and compresses dynamic expression which results in a sound with softened transient attacks. It subtly alters harmonic relationships between instruments and more importantly, it interrupts the natural rhythmic continuity that allows music to breathe. Listeners frequently describe the improvement achieved by a world-class master clock not as sounding "more digital," but as sounding remarkably more analogue - effortless, fluid and naturally coherent. The NADAC C has been engineered specifically to restore that coherence.

Built Around an Extraordinary Oscillator

Every great master clock begins with an exceptional oscillator. At the heart of the NADAC C is an ultra-high precision SC-cut crystal oscillator, selected because of its exceptional thermal stability, remarkably low ageing characteristics and extraordinarily low phase noise. Unlike conventional oscillators used in many consumer audio products, each oscillator selected for the NADAC C undergoes an extensive ageing process lasting a minimum of 120 days before final calibration.

This lengthy stabilisation period allows the crystal characteristics to mature naturally, significantly reducing long-term frequency drift and ensuring outstanding consistency over years of operation. Only after this rigorous process is the oscillator integrated into the finished clock assembly.This painstaking preparation reflects Master Fidelity's philosophy that ultimate musical performance begins long before a component reaches the listening room.

Beyond Frequency Accuracy

Many manufacturers promote frequency accuracy alone. Master Fidelity understands that absolute frequency accuracy represents only one element of exceptional clock performance.Far more significant is the ability to maintain extraordinarily low phase noise. Phase noise represents microscopic fluctuations in timing that occur around the intended clock frequency. These fluctuations directly influence jitter performance throughout the digital signal chain.

The NADAC C has been engineered specifically to minimise these fluctuations through meticulous oscillator selection, sophisticated clock circuitry and advanced power regulation. The resulting reference signal exhibits remarkable temporal purity, allowing downstream components to recover audio clocks with astonishing stability. This difference is immediately audible. Musical textures emerge from an exceptionally quiet background. Instrumental outlines become more precise without becoming artificially sharp. Complex orchestral passages retain separation and dimensionality, while voices acquire an effortless naturalness that conventional digital systems often struggle to reproduce.

Engineering Without Compromise

The pursuit of perfect timing extends throughout every aspect of the NADAC C's construction. Rather than relying upon conventional printed circuit materials, Master Fidelity employs specialised hydrocarbon ceramic substrates possessing exceptionally low dielectric loss. These advanced materials minimise microscopic energy storage within the circuit itself, reducing signal distortion while preserving the integrity of the outgoing clock reference.

Signal paths have been carefully optimised to reduce impedance discontinuities. Component selection prioritises pulse performance rather than simple electrical tolerance. Mechanical construction has been designed to suppress vibration that might influence oscillator stability. Nothing has been overlooked. Even the internal layout reflects a philosophy of absolute precision, ensuring every stage contributes to preserving timing purity.

Constant Thermal Stability

Temperature has an enormous influence upon oscillator performance. Minute thermal variations can alter crystal behaviour sufficiently to introduce long-term timing instability. To eliminate this variable, the NADAC C incorporates an exceptionally sophisticated constant-temperature operating environment supported by an ultra-low-noise regulated power architecture.

Rather than allowing the oscillator to experience continual temperature fluctuations, the clock maintains carefully controlled operating conditions that preserve optimum stability regardless of changing ambient environments. The result is consistent performance from the moment critical listening begins until the final note fades into silence.

A Smarter Approach to Clock Generation

One of the most fascinating aspects of the NADAC C lies in its intelligent clock architecture. A standard 10 MHz master reference cannot directly generate common audio sampling frequencies because the mathematical relationships are not simple integer multiples. Many systems therefore compromise timing performance during frequency conversion.

Master Fidelity has developed a sophisticated architecture that uses the ultra-stable 10 MHz reference as the foundation for proprietary clock regeneration techniques employed within compatible NADAC components. This approach combines the exceptional long-term stability of the master reference with ultra-low jitter audio-frequency clock generation specifically optimised for music reproduction. Rather than forcing a single oscillator to perform every task, each stage is optimised for its intended purpose. The outcome is timing precision measured in mere femtoseconds.

Designed for the NADAC Ecosystem

The NADAC C has been developed specifically to complement the Master Fidelity NADAC series of digital components, particularly the acclaimed NADAC D DAC. While the DAC itself already incorporates advanced proprietary clock recovery technology, the addition of the NADAC C provides an even more stable external timing reference from which the DAC derives its internal operating clocks.

This partnership allows the complete digital conversion architecture to perform closer to its theoretical limits. Where improvements are cumulative which provides:

• Lower phase noise which enables lower jitter.
• Lower jitter improving conversion accuracy.
• Improved conversion accuracy revealing greater musical realism.

Each of these enhancements build naturally upon the previous one. Rather than introducing an artificial sonic character, the NADAC C simply removes another layer of digital uncertainty.

Listening Beyond Resolution

The benefits of a world-class master clock cannot be understood simply by describing resolution. Many listeners are surprised that the most immediate improvements are emotional rather than analytical, where the music becomes calmer, more relaxed and more believable. Spatial information expands naturally beyond the loudspeakers while individual performers occupy remarkably stable positions within the soundstage.

Silence between notes becomes genuinely silent where microdynamic shadings appear effortless & more tangible. Low-frequency instruments exhibit greater authority while simultaneously revealing more texture and pitch definition. Percussion gains startling realism through improved transient accuracy; string instruments develop richer harmonic complexity & structure and piano acquires convincing weight and body.

Most importantly, the entire performance becomes more continuous & liquid, allowing the music to flow with remarkable rhythmic continuity. Listeners often find themselves focusing less upon technical aspects of the music and becoming more immersed and engaged in the artistry of the musicians. These are the most common results obtained when listening to equipment which possess far superior timing.

Crafted for Reference Systems

Like every Master Fidelity component, the NADAC C has been designed without compromise. Its beautifully machined enclosure reflects the same engineering precision found within. The substantial chassis provides mechanical rigidity while contributing to vibration control, ensuring the sensitive oscillator environment remains undisturbed.

Every connector has been selected to preserve signal integrity. All circuits have been optimised for absolute stability and to provide the best performance. Every design decision supports the singular objective of achieving the highest possible level of digital timing precision. This is engineering excellence, executed purely in the pursuit of absolute musical authenticity.

The Invisible Upgrade

Unlike changing loudspeakers or amplifiers, the addition of a master clock rarely alters the tonal balance of a system. Instead, it improves almost every other aspect simultaneously; images become more stable, dynamics become more expressive, spatial cues become more convincing and timing becomes more natural & lifelike.

The music simply sounds completer and more believable. Many experienced listeners describe the improvement as removing a subtle layer of haze that they had never consciously recognised until it disappeared. Once experienced, it becomes extraordinarily difficult to return to an unsynchronised digital system.

For Those Who Pursue Absolute Fidelity

The Master Fidelity NADAC C represents the culmination of decades of extensive research into precision timing for high-end digital audio. It is a component designed not to impress through unnecessary complexity, but through meticulous engineering, uncompromising execution and an unwavering commitment to preserving the integrity of recorded music.

When partnered with Master Fidelity's NADAC D’s revolutionary True 1-Bit conversion technology, the NADAC C establishes an extraordinarily stable temporal foundation that allows every subsequent stage of digital reproduction to perform with unprecedented precision. For discerning audiophiles seeking the final refinement in a world-class digital system, the NADAC C is far more than a master clock.

It is the heartbeat of digital perfection.

Key Features

• Ultra-high precision 10 MHz master reference clock.
• Carefully selected SC-cut crystal oscillator with a minimum of 120-day ageing process.
• Exceptionally low phase noise and ultra-low jitter performance.
• Advanced constant-temperature oscillator environment.
• Ultra-low-noise regulated power supply architecture.
• Hydrocarbon ceramic circuit boards with extremely low dielectric loss.
• Precision-engineered clock distribution circuitry.
• Optimised for all Master Fidelity NADAC digital components.
• All peripheral parts used in the NADAC C distribution output circuits use high-performance pulse application models to ensure perfect transmission and excellent cable drive capability.
• Improves imaging, spatial accuracy, microdynamic shadings and musical timing.
• Reference-grade construction for uncompromising high-end audio systems.

Experience the Master Fidelity Difference

The Master Fidelity NADAC C Master Clock is available through Knox Audio, Australia's destination for the world's most exclusive high-performance audio systems. We invite you to experience how absolute precision in digital timing transforms every aspect of musical reproduction, revealing recordings with extraordinary realism, dimensionality and emotional authenticity.

Technical Specifications