
T1 Time Reference
Absolute Time Mastery
In digital audio, faithful reproduction begins with time. Faithful reproduction depends on each sample reaching the DAC at precisely the right interval. Any drift or irregularity in timing erodes musical integrity, blurring transients, obscuring detail, and diminishing realism. This is why CH Precision goes to extraordinary lengths to ensure absolute stability in the time domain across every digital component we design. While our proprietary Clock-Sync system already enables multiple CH components to operate from a shared master clock provided by the DAC itself, the ultimate refinement is to synchronize your entire digital chain to a single, superior external reference—the role fulfilled by the T1 Time Reference.
When using a transport with a separate DAC, the need to recover the clock signal from the transport can introduce minute timing discrepancies—resulting in jitter that softens resolution and blurs musical focus. The T1 eliminates this risk by serving as a single, ultra-stable timing reference for both DAC and transport. Its oven-controlled crystal oscillator (OCXO), thermally stabilized within a solid billet aluminum block, delivers exceptional consistency and vanishingly low phase noise. When DACs such as the C1.2 or C10 are paired with CH transports like the D1.5 or D10, the T1 unifies system timing—unlocking finer detail, greater spatial precision, and a more natural, expressive musical flow


Time. Truth. Transparency.
The T1’s authority begins with its timekeeping core—a custom-built oven-controlled crystal oscillator (OCXO) engineered for absolute stability. Encased in a massive billet of solid aluminum, the oscillator is shielded from temperature fluctuations, while its entire assembly rests on a bed of soft silicone gel to absorb even the faintest mechanical vibrations. This meticulous physical isolation ensures a reference signal of unwavering precision, forming the bedrock of the T1’s ultra-low-phase-noise performance.
From there, precision is delivered with purpose. Six fully independent outputs, each with its own buffer stage, can be configured to supply either a 10 MHz sine or square wave at 1 V or 500 mV peak-to-peak. Transformer coupling maintains electrical isolation and phase integrity, allowing multiple components to share the same perfect timing source without compromise. Whether clocking a CH Precision DAC and transport, a third-party streamer, or an entire digital ecosystem, the T1 binds each element to a common, flawless heartbeat—elevating musical flow, spatial definition, and resolution to their full potential.

Optimizing Temporal Fidelity
The T1 sets an uncompromising benchmark for clock accuracy and stability. At its core is a 10 MHz oven-controlled crystal oscillator (OCXO), encapsulated in a massive billet-aluminum block for exceptional thermal stability and mechanically isolated to suppress even the faintest micro-vibrations.
Unlike conventional word-clock systems, which rely on crystals locked to 44.1 or 48 kHz families, the T1 starts with a cleaner 10 MHz reference and divides down digitally using an advanced all-digital PLL. This design eliminates the noisier “direct” crystals found in word clocks, producing measurably lower in-band jitter and far superior time-domain stability. Where most clocks operate at the picosecond (10⁻¹² s) level, the T1 achieves femtosecond performance (10⁻¹⁵ s)—roughly 1,000× more precise. The result is a foundation of vanishingly low phase noise, ensuring that digital conversion preserves timing integrity with unprecedented clarity and coherence.
Every element of the T1’s power and signal architecture is engineered for purity. Each critical stage—the OCXO itself, its buffer, and the output circuitry—draws from its own dedicated, galvanically isolated, ultra-low-noise supply. A mechanically decoupled, magnetically and electrostatically shielded toroidal transformer feeds the system, eliminating vibration-borne interference. Together, these measures ensure that nothing compromises the core task: preserving musical integrity at the most fundamental level—time.
This architecture delivers performance that surpasses Rubidium-based alternatives, without their finite lifespan, radioactive content, or disposal challenges. The audible result is cleaner data transfer and more precise conversion, revealing subtler textures, more stable spatial cues, and a heightened sense of musical realism.
For absolute, long-term accuracy, an optional GPS synchronization module locks the T1 to Cesium atomic clocks embedded within the satellite network—ensuring timing precision that remains unwavering for years to come.
Document and Firmware Downloads
A resource built with the same precision and care that define our instruments, the CH Precision Downloads area provides access to the most recent manuals, firmware updates, spike installation guides, and product brochures. Each document reflects our engineering culture—meticulous in detail, exact in purpose, and designed to ensure that every component performs precisely as intended.
These materials are intended to support owners and partners in configuring, maintaining, and optimising their CH systems. Should you have any questions or require further assistance, we encourage you to contact your authorised CH Precision dealer or reach out directly through our Technical Support form. Our teams are committed to providing the same standard of excellence in service that we apply to our engineering—so that every listening experience remains true to the performance we envisioned.



Mastering the Art of Digital Timing
The T1 Time Reference is engineered to address one of the most overlooked yet decisive factors in digital playback—time-domain precision. By supplying an ultra-stable 10 MHz reference signal, the T1 can serve as the master clock for any digital device with a compatible external clock input, whether CH Precision or third-party. This stand-alone flexibility makes it equally at home in a complete CH system or partnered with DACs, streamers, and transports from other high-performance brands.
By locking all connected components to a common, exceptionally accurate standard, the T1 preserves the micro-timing cues that shape spatial depth, tonal realism, and the natural ebb and flow of music. From disc transport to digital conversion, every stage benefits from reduced jitter, tighter coherence, and a more lifelike sense of performance.
Within a CH Precision digital front end—or integrated into select third-party setups—the T1 becomes the temporal anchor around which the entire system revolves. Its contribution is not about altering the musical signal, but about safeguarding the exact timing that gives it life. The result is heightened resolution, greater separation between instruments, and a deeper, more immersive connection to the recorded event.
Specifications
General
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Type: Reference Clock
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Options: GPS synchronization module
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Color: Silver (standard), Anthracite or Champagne (option)
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Dimensions: 440 x 440 x 133 mm (W x D x H)
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Weight: 20kg
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Operating conditions: 5°C<T<35°C, 5%<humidity<85% no condensation
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Power supply: Selectable 100V, 115V or 230V AC, 47Hz to 63Hz
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Power consumption: <0.5W standby, 50W warm-up, 40W nominal
User interface
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Display: 800 x 480 pixels, 24 bit RGB AMOLED
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Control: 5-button interface, Android app (iOS app to be released)
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Firmware update: via USB flash drive or the Internet
Output
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Type: 6x BNC
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Impedance: 75Ω
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Level: 500mVp-p or 1Vp-p, loaded with 75Ω
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Waveform: Sine or Square wave
Performance
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Phase noise:
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< -105dBc/Hz @ 1Hz
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< -125dBc/Hz @ 10Hz
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< -145dBc/Hz @ 100Hz
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< -155dBc/Hz @ 1kHz
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< -165dBc/Hz @ 10kHz and above
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Nominal frequency:
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10MHz, +/- 20ppb, internal mode
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10MHz, +/- 1ppb maximum, GPS option locked for 1 hour
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External Reference Input level
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5V TTL
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50Ω BNC input
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Accepted Reference input frequencies: 1 PPS, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz, 100kHz
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Reference input frequency deviation maximum: +/- 0.1ppm
