Timing is everything

An external master clock that makes timing the foundation of your system. The SMSL G1 locks your digital gear to a single 10 MHz reference so transients are tighter, imaging feels realer, and bass is locked in. An SC-cut OCXO with ±3 ppb accuracy sits under a constant-temperature shield, fed by a low-noise linear supply and four independent buffer stages that drive up to four components at once. Compact, solid, and compatible with CD transports and DACs that accept a 10 MHz input, like SMSL’s own PL200T MQA-CD Transport and PA200 GaN Power Amplifier.

Bring your music in lock step

Digital audio lives and dies by clock accuracy. The G1 provides a single, steady 10 MHz reference to your DAC, transport, and other digital gear so they agree on when “now” is. Less nanosecond-level jitter means crisper imaging, fewer smeared transients, and low frequencies that stop and start when they should. 

SC-cut OCXO for long-term stability

At the center is an SC-cut oven-controlled crystal oscillator (OCXO) with phase noise measured at −105 dBc/Hz at 1 Hz offset and frequency accuracy within ±3 ppb. In plain terms: drift is tiny and noise is low. It reaches basic thermal stability in about two minutes, and it settles further after roughly ten minutes.

constant-temperature shield, calmer phase noise

The OCXO sits inside a dedicated, insulated chamber that evens out micro-temperature swings and blocks external heat sources. Stable temperature equals stable frequency, and it’s one of the simplest ways to keep phase noise down and microdetail intact.

four 10 MHz outputs with independent buffers

One clock, four destinations. Each BNC output is driven by its own buffer to hold output impedance steady and handle real-world loads without sag. Run a transport and a DAC in parallel, add a DDC or streamer, and keep everything on the same timeline. Outputs are 3.3 Vpp square wave with selectable 50/75 Ω loading to match the gear on the other end.

low-noise power with room to experiment

A toroidal linear supply and multi-stage LDO regulation create a quiet 6 µVrms power environment for the oscillator and output stages. Prefer to bring your own supply? A rear DC input accepts 9–15 V, giving tinkerers a clean path to try a favorite linear power supply. 

compact, milled aluminum chassis

A CNC-machined unibody keeps resonance down and looks tidy on the rack. Suspension plus silicone feet reduce desktop vibration. A single two-color LED says everything you need: blue for AC input, red for DC. The footprint is small and easy to place: 7.87in × 1.89in × 7.32in (200 × 47.9 × 186 mm).

built to stack with SMSL

Tie the G1 to SMSL’s 200-line stack—PL200T, D200 DAC, and PA200—for a coherent, clocked-from-source chain. It also complements SMSL’s flagship T2/D2R/P2 trio. 

product highlights

• SC-cut OCXO master clock with ±3 ppb accuracy
  
• Low phase noise: −105 dBc/Hz at 1 Hz offset
  
• Four independently buffered 10 MHz BNC outputs
• Output level 3.3 Vpp square wave with 50/75 Ω impedance options
  
• Constant-temperature shielded chamber around the OCXO
  
• Linear AC power supply with multi-stage LDO regulation—~6 µVrms noise
  
• Optional DC input (9–15 V) for external power supplies
  
• Auto-switching AC input for global use
  
• Vibration-damped chassis—CNC aluminum body with silicone feet
  
• Simple status LED—blue for AC, red for DC
  
• Pairs cleanly with SMSL PL200T, D200, PA200, and flagship T2/D2R/P2
  

specs

• Clock outputs: 4 × BNC, 10 MHz, 3.3 Vpp square wave, 50/75 Ω
  
• OCXO performance: −105 dBc/Hz @ 1 Hz phase noise, ±3 ppb accuracy
  
• Warm-up: ~2 minutes to stabilize; ~10 minutes recommended before listening
  
• Power—AC: 100–240 V, 50/60 Hz (auto-switching)
  
• Power—DC: 9–15 V, 1 A (5.5 × 2.1 mm plug)
  
• Power consumption: 12 W during heating, ~3 W in normal use
  
• Chassis noise environment: ~6 µVrms with linear PSU + secondary LDOs
  
• Operating temperature: 41–95 °F (5–35 °C)
  
• Operating humidity: 5–85% non-condensing
  
• Storage temperature: −4–131 °F (−20–55 °C)
  
• Dimensions: 7.87 × 1.89 × 7.32 in (200 × 47.9 × 186 mm)
  
• Weight: 3.57 lbs (1.618 kg)
  

what’s included

• SMSL G1 master clock generator
  
• AC power cord
  
• Quick start guide and warranty card