Matrix Audio SC-1 Audio Grade Reference Clock
Matrix Audio SC-1 Audio Grade Reference Clock The most precise timing signal your digital system has ever received. The Matrix Audio SC-1 is a purpose-built, audio-grade 10 MHz ext ernal master clock designed for audiophiles who have reached the ceiling of what their DAC, streamer, or transport can deliver on its internal clock — and want to know what those components are truly capable of. Built around a custom-made OCXO module using an SC-cut crystal, with four independent buffered outputs, dual isolated power supply regulation, and vibration-damped construction, the SC-1 delivers a reference-grade timing signal that resets the performance ceiling of any connected component with a 10 MHz external clock input. The audible result is a more coherent, more focused, and more naturally timed presentation — the qualities that experienced listeners describe as the system finally sounding like music rather than digital reproduction. Available now at All Elite Audio, your authorized Matrix Audio dealer in Timonium, Maryland — with in-store demos, expert guidance, and nationwide shipping. Why an External Reference Clock Makes a Difference Every digital audio component — DAC, streamer, transport, network switch — contains an internal clock that controls the timing of its digital processing. The accuracy of that clock directly determines how precisely each audio sample is timed during conversion and transmission. Even very small timing irregularities, measured in picoseconds or femtoseconds, cause a form of distortion called jitter that manifests as a subtle but audible softening of transients, a reduction in imaging precision, and a slight cloudiness in the lower midrange and bass. Most internal clocks in audio components are adequate but not exceptional. They are designed to a cost point, share a power supply with the rest of the circuitry, and are subject to the thermal and electromagnetic environment inside the chassis. An external reference clock like the SC-1 replaces that internal timing source with a far more precise, far more stable signal — and the component uses that signal as its master reference for all internal timing operations. The result is a measurable and audible improvement in timing precision throughout the system. SC-Cut OCXO — Why the Crystal Type Matters At the core of the SC-1 is a custom-made OCXO — Oven-Controlled Crystal Oscillator — module built around an SC-cut crystal. Understanding why the SC-cut matters requires understanding the two most common crystal orientations used in precision oscillators. The more common AT-cut crystal is widely used in standard audio clocks and provides good performance at moderate cost. The SC-cut — Stress Compensated cut — is a more complex and expensive manufacturing process that produces a crystal with significantly lower sensitivity to mechanical stress and a much flatter frequency-versus-temperature curve. The SC-cut crystal also exhibits superior aging characteristics, meaning its frequency accuracy drifts less over time than an AT-cut equivalent. The combination of the SC-cut crystal's inherent stability and the OCXO's temperature-controlled oven chamber — which holds the crystal at a constant, precisely regulated temperature regardless of ambient conditions — produces a timing source with phase noise and frequency stability that is extremely difficult to achieve with conventional AT-cut designs. The result is a measured frequency accuracy of ±0.01 ppm and phase noise performance of better than -118 dBc/Hz at 1 Hz offset, -140 dBc/Hz at 10 Hz, and -150 dBc/Hz at 100 Hz — figures that represent genuine reference-grade performance. Four Independent Buffered Outputs The SC-1 provides four 10 MHz BNC outputs, each driven by its own dedicated output buffer derived from the same master oscillator source. The independent buffers serve two critical functions: they ensure each output maintains a stable, consistent impedance of 50 ohms regardless of what is connected or how many outputs are in use simultaneously, and they prevent any interaction between connected devices from affecting the clock signal at other outputs. All four outputs can be used at the same time to synchronize up to four components — a DAC, a streaming transport, a network switch, and a CD transport for example — without any degradation to the signal delivered to any individual device. Output waveform is available in either sine wave or square wave, factory-configured to match the requirements of the connected equipment. Matrix Audio recommends the square wave option where the receiving device supports it, as square wave provides higher locking accuracy than sine wave due to its faster and more clearly defined transitions between states. Dual Isolated Power Supply Regulation One of the most important and often overlooked aspects of a reference clock's design is the power supply architecture. Oven-controlled crystal oscillators require a heating element — the oven chamber — to maintain the crystal at its target temperature. That heating element draws variable current as it cycles on and off to maintain temperature, which can create fluctuations in the power supply that couple noise into the clock signal itself. The SC-1 addresses this with dual independent multi-stage linear regulator supplies: one dedicated exclusively to the oven control circuit, and one dedicated exclusively to the clock circuit. These two power domains are completely separate from each other, ensuring that the thermal cycling of the oven chamber creates no interference whatsoever in the clock circuit's power supply. Combined with a toroidal transformer and multi-stage linear regulation throughout, this is a power supply architecture that takes the oscillator's most fundamental noise source and isolates it completely from the signal that matters. An automatic voltage detection circuit monitors the incoming AC voltage and switches the transformer windings accordingly, providing worldwide voltage compatibility without manual switching. Overvoltage and undervoltage protection circuits are active at all times. 1PPS Calibration Input and Free Calibration Service Even the most precise oscillator experiences a small degree of frequency drift over very long periods of time — this is a fundamental physical characteristic of crystal oscillators known as aging. To address this, the SC-1 includes a 1PPS (one pulse per second) reference input on the rear panel. When connected to an external second-based reference source — a GPS-disciplined oscillator or atomic reference, for example — the SC-1 automatically calibrates its output frequency against that external reference and corrects any accumulated drift. The front-panel LED indicates calibration status in real time. For SC-1 owners who do not have access to an external 1PPS reference, Matrix Audio offers a free factory calibration service to ensure the clock remains within specification over time. This is an unusually generous long-term support commitment for a product at this price point. CBVB Vibration-Absorbing Foot Pads Mechanical vibration is a subtle but real source of frequency instability in precision oscillators. The SC-1 is equipped with Matrix Audio's CBVB vibration-absorbing foot pads, which decouple the chassis from the shelf or equipment rack it rests on. By isolating the oscillator from external mechanical vibration — from speakers, air movement, or structural vibration in the room — the CBVB pads help ensure the crystal operates in the most stable mechanical environment possible, complementing the thermal stability provided by the oven chamber. Warm-Up and Operational Stability After power-on, the OCXO requires a period of time to bring the oven chamber to its target operating temperature — typically in the range of 10 to 15 minutes depending on ambient conditions. During warm-up the front-panel LED indicates that the clock has not yet reached thermal stability. Once the oven reaches its setpoint and the LED confirms stable operation, the SC-1 maintains constant frequency with essentially no variation for as long as it remains powered. Many users who own reference clocks leave them powered on continuously to eliminate the warm-up period entirely and ensure the system is always ready at full performance. Build Quality and Design The SC-1 continues Matrix Audio's established industrial design language — CNC-machined aluminum alloy chassis with the signature perforation pattern and precisely beveled edges that identify Matrix Audio products. The chassis is available in both black and silver. At 330mm wide, 267mm deep, and 97mm tall, it matches the footprint of other Matrix Audio components for a visually cohesive equipment stack. The construction provides both the electromagnetic shielding and the mechanical rigidity that a precision clock oscillator requires. System Compatibility — Which Components Accept the SC-1 The SC-1 is compatible with any digital audio component that includes a 10 MHz BNC external clock input. Within the Matrix Audio ecosystem, this includes the NT-1 streaming transport, the Element X2 and Element X2 Pure DACs, the MS-1 music streamer, and other Matrix Audio components with external clock inputs. The SC-1 also works with DACs, transports, streamers, and network switches from any other manufacturer that accept a 10 MHz reference input — including EverSolo DAC-Z10, and many professional and high-end consumer devices. A high-quality 50-ohm BNC clock cable is required to connect the SC-1 to any receiving device; the quality of this cable matters and our team can advise on appropriate options. Key Specifications Clock Oscillator: Custom OCXO with SC-cut crystal Output Frequency: 10 MHz Frequency Accuracy: ±0.01 ppm Phase Noise: Better than -118 dBc/Hz at 1 Hz / -140 dBc/Hz at 10 Hz / -150 dBc/Hz at 100 Hz offset Outputs: 4 x 10 MHz BNC, independent buffered, 50 ohm impedance Output Waveform: Sine wave or square wave (factory configured) Output Level: 0.5 Vrms (sine) / 1.0 Vrms (square) Calibration Input: 1PPS BNC input for external reference Calibration Indicator: Front-panel LED Power Supply: Dual independent multi-stage linear regulation — separate oven circuit and clock circuit supplies; toroidal transformer Voltage Detection: Automatic, worldwide compatibility Protection: Overvoltage and undervoltage protection circuits Vibration Isolation: Matrix Audio CBVB vibration-absorbing foot pads Power Consumption: Less than 20W Chassis: CNC-machined aluminum alloy, Matrix Audio signature design Colors Available: Black, Silver Dimensions (W x D x H): 330 x 267 x 97 mm Weight: 4.4 kg (9.7 lbs) Warranty: 1 year manufacturer warranty Additional Service: Free factory calibration service from Matrix Audio Why Buy From All Elite Audio All Elite Audio is an authorized Matrix Audio dealer located in Timonium, Maryland — part of the greater Baltimore area. We carry the full Matrix Audio lineup including the SC-1 reference clock, the NT-1 streaming transport, the SS-1 Pro network switch, the SI-1 network isolator, and Matrix Audio's complete DAC and streaming component range. Our team has direct experience with clock-based system optimization and can help you determine whether the SC-1 is the right upgrade for your specific system and which clock cable to use for the connection. We offer white-glove service, in-store demos, and support before and after your purchase. Whether you are local to Maryland or ordering nationwide, we are here to help you get the most from your system. Call: 443-402-5055 Text: 443-402-5064 Visit: 1921 York Rd, Timonium, MD 21093 Frequently Asked Questions — Matrix Audio SC-1 Reference Clock What is the Matrix Audio SC-1 and what does it do? The Matrix Audio SC-1 is a 10 MHz external master clock — a standalone device that generates an exceptionally precise and stable timing signal and delivers it to compatible digital audio components via BNC clock cables. DACs, streaming transports, network switches, and other digital audio devices that include a 10 MHz external clock input can lock their internal processing to the SC-1's reference signal, replacing their internal oscillators with a far more accurate timing source. The audible result is reduced jitter, a lower noise floor, more precise imaging, tighter transient response, and the overall quality improvement that experienced listeners associate with the system sounding more coherent and natural. What makes the SC-cut crystal in the SC-1 special? The SC-cut — Stress Compensated cut — is a more complex and expensive manufacturing process than the AT-cut crystals used in most audio clocks. SC-cut crystals exhibit lower sensitivity to mechanical stress, a flatter frequency-versus-temperature curve, and superior long-term aging characteristics — meaning the crystal's frequency accuracy drifts less over time. Combined with the OCXO's temperature-controlled oven that holds the crystal at a constant operating temperature, the SC-cut design produces phase noise and frequency stability that is measurably and audibly superior to AT-cut based oscillators. What phase noise performance does the SC-1 achieve? The SC-1 achieves measured output phase noise of better than -118 dBc/Hz at 1 Hz offset from the carrier, -140 dBc/Hz at 10 Hz offset, and -150 dBc/Hz at 100 Hz offset. These are reference-grade figures that reflect the quality of the SC-cut OCXO and the care taken in the output buffer and power supply design to avoid degrading the oscillator's inherent performance. Why does the SC-1 have two separate power supplies — one for the oven and one for the clock? The oven chamber that holds the crystal at temperature requires a heating element that cycles on and off as it maintains its setpoint. This cycling draws variable current that creates power supply fluctuations which, in a conventional single-supply design, can couple noise into the clock circuit. The SC-1 uses completely independent multi-stage linear regulator supplies for the oven circuit and the clock circuit, ensuring the thermal cycling of the oven has no path to the clock signal. This is one of the most important design decisions in the SC-1 and a key reason its measured phase noise at the output ports is so close to the OCXO's own specification. Should I use sine wave or square wave output on the SC-1? Matrix Audio recommends square wave output for devices that support it, as square wave provides higher clock locking accuracy due to its faster, more sharply defined signal transitions. Sine wave is appropriate for devices that are specified or designed specifically for sine wave clock input. When ordering, the factory configures the output waveform based on the requirements of the connected device — contact All Elite Audio or Matrix Audio to confirm which waveform is appropriate for your specific DAC or transport. What is the 1PPS input on the SC-1 used for? The 1PPS — one pulse per second — input allows the SC-1 to be connected to an external reference source such as a GPS-disciplined oscillator or atomic clock that provides a one-pulse-per-second timing signal. When this reference is connected, the SC-1 automatically calibrates its output frequency against it, correcting any accumulated drift. The front-panel LED indicates active calibration status. For users without a 1PPS reference source, Matrix Audio offers free factory calibration services to ensure the SC-1 maintains its specified accuracy over time. How long does the SC-1 take to reach full stability after power-on? The OCXO requires time to bring the oven chamber to its target operating temperature — typically 10 to 15 minutes depending on ambient room temperature. During this warm-up period the front-panel LED indicates the clock has not yet reached thermal stability. After stabilization, the frequency accuracy and phase noise remain essentially constant for as long as the unit remains powered. Many owners of reference clocks leave them powered on continuously to eliminate the warm-up period entirely. Which digital audio components are compatible with the Matrix Audio SC-1? Any digital audio component with a 10 MHz BNC external clock input is compatible. Within Matrix Audio's lineup this includes the NT-1 streaming transport, the Element X2 and Element X2 Pure DACs, and the MS-1 music streamer. The SC-1 also works with compatible components from other manufacturers including the EverSolo DAC-Z10, as well as many professional and high-end consumer DACs, CD transports, and network switches that accept a 10 MHz reference. Our team can confirm compatibility for any specific component. What clock cable do I need to connect the SC-1 to my DAC or streamer? The SC-1 outputs a 50-ohm signal via standard BNC connectors. A high-quality 50-ohm BNC clock cable is required for each connection between the SC-1 and the receiving device. The quality and impedance accuracy of the clock cable matters — a poorly matched or high-capacitance cable can degrade the timing signal at the receiving end. Our team at All Elite Audio can recommend appropriate clock cables for your specific system. Can the SC-1 drive all four outputs simultaneously without degradation? Yes. Each of the four 10 MHz outputs has its own dedicated independent buffer, all driven from the same master oscillator. The buffers maintain stable 50-ohm impedance on each output regardless of load, and prevent any interaction between connected devices from affecting the signal at other outputs. All four outputs deliver an identical, full-quality clock signal simultaneously. What vibration isolation does the SC-1 include? The SC-1 is equipped with Matrix Audio's CBVB vibration-absorbing foot pads, which decouple the chassis from the supporting surface to minimize the transmission of mechanical vibration to the oscillator. Since mechanical stress can affect crystal frequency even in an oven-controlled design, vibration isolation is a meaningful contribution to long-term stability and the consistency of the clock's output phase noise. Where can I buy the Matrix Audio SC-1 and get expert advice? All Elite Audio is an authorized Matrix Audio dealer with a full home audio showroom located at 1921 York Rd, Timonium, Maryland 21093. We carry the complete Matrix Audio lineup and can help you evaluate whether the SC-1 is the right upgrade for your system, which outputs to use, and which clock cables are appropriate. Call us at 443-402-5055 or text 443-402-5064. We also ship nationwide.
