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Antelope Audio OCXHD

768kHz Master Clock

Antelope Audio OCXHD

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Product Description for the Antelope Audio OCXHD

768 kHz HD Master Clock

For over a decade, Antelope’s legendary OCX Master Clock has been a dominant force in the audio world. This legacy now continues with the newest master clock by Antelope Audio - Isochrone OCX HD.

OCX HD raises the bar yet again, delivering sample rate support of up to 768 kHz, Antelope’s best-in-class 4th generation Acoustically Focused Clocking (AFC) jitter management algorithm and oven-controlled crystal oscillator. OCX HD Master Clock offers a great variety of clocking options – 10 configurable in pairs Word Clock Outputs on BNC, four AES/EBU Outputs and two more on S/PDIF. This vast assortment of connectivity makes the OCX HD the most versatile audio master clock on the market, while proven,proprietary clocking technology delivers the most musical and reliable audio sync generation on the market.

Additionally, OCX HD offers two Word Clock Inputs and a Video Sync Input, which can resolve to a huge variety of SD and HD formats, as well as clock distribution with gear-boxing, and pull-up and pull-down rates, as featured in the triple clock powerhouse, Trinity Master Clock. A 10 MHz Input allows for syncing with Antelope's newest Atomic Clock – 10MX.

Antelope’s latest master clock benefits from flexible firmware update functionality, as featured in all new-generation Antelope products, allowing for fast and easy firmware updates on the user-friendly software control panel, available for both OS X and Windows. The desktop app provides convenient remote control to simplify project workflow. The device is also easily configurable from an elegant front panel, which will add a futuristic aesthetic to any gear rack.


  • 4th generation Acoustically Focused Clocking (AFC) jitter management algorithm            
  • Sample rate support of up to 768 kHz over WC
  • Multipliers/dividers enabling the output of 5 different sample rates
  • 4x AES/EBU and 2x S/PDIF clocking outputs up to 192kHz for additional connectivity
  • Comprehensive audio gear-boxing
  • Universal Video Input on BNC
  • Atomic clock input for optimum accuracy and calibration
  • 3 recallable presets
  • Rate lock from Control Panel to avoid settings change during session
  • Ergonomic front panel control
  • Software Control Panel, allowing remote control and firmware updates via USB

Clocking System                

  • 4th generation Acoustically Focused Clocking
  • 64-bit DDS
  • Oven Controlled Crystal Oscillator
  • Clock Stability : <+/- 0.02 ppm, oven controlled at 64.5 C/148.1 F
  • Clock Aging : < 1 ppm per year
  • Clock Calibration : <+/- 0.001 ppm
  • Atomic Clock Input : 10 MHz
  • Sample Rates Generated : 32, 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384, 705.6, 768kHz

Master Clock Outputs           

  • 10x Word Clock Outputs up to 768kHz
  • 4x AES/EBU Outputs up to 192kHz
  • 2x S/PDIF Outputs up to 192kHz     


  • 2x Word Clock Inputs up to 768kHz
  • 1x Video Input accepting wide range of SD and HD video signals
  • 1x Atomic Input
  • 2x S/PDIF Inputs up to 192kHz
  • 1x AES/EBU Input up to 192kHz
  • 1x USB Input for control
  • Power supply : AC Universal Input ~95-245V, 20 Watts Max
  • Operating Temperature : 0-50 C / 32-122 F
  • Weight : 2.65 kg/ 5.84 lb

Dimensions (unit)

  • Width: 482.6 mm / 19"
  • Height: 44 mm / 1.75"
  • Depth: 230 mm / 9.05"
Brand Antelope Audio
Weight 8.0000
Dimensions (WxHxD) No

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