New Antelope Audio Isochrone OCX HD Crystal Clock

In celebration of more than a decade of clocking leadership and the launch of its classic OCX crystal-based digital clock ten years ago, Antelope Audio [Hall A – Booth 6596] announces its latest crystal-based master clock: the Isochrone OCX HD. OCX HD, which packs Antelope’s latest clocking innovation into a 1U rackspace, supports sample rate up to 768 kHz and features the company’s best-in-class fourth generation Acoustically Focused Clocking (AFC) jitter management algorithm and oven-controlled crystal oscillator. The new OCX HD is a perfect ‘foundational’ clocking solution for mastering and recording studios, project studios, film-scoring, post-production studios and live sound installations. Occupying just a single rackspace, the new OCX HD features Antelope’s most accurate oven-controlled crystal oscillator, while being very competitively priced as an ‘all-in solution.’

“Accurate clocking technology is an essential ingredient of any meaningful digital audio content,” commented Igor Levin, founder and CEO of Antelope Audio. “With the launch of OCX HD, we are bringing our very best crystal-based clocking solution to a broader base of production professionals — this represents a tremendous opportunity for anyone involved in music or film production to realize the same clarity and sonic imaging benefits that many of the top mastering houses around the world have relied on for years.”

The new OCX HD combines many of Antelope’s revolutionary clocking developments over the last 10 years, when the company’s original OCX clock was launched. Since then, the company has refined its proprietary Acoustically Focused Clocking (AFC) jitter management algorithm, as well as made significant improvements in its circuit board and power supply technologies. The original OCX — which supported 192 kHz when it was launched in 2005 — was Antelope Audio’s first product and considered by many to be the finest quality clock on the market in its price range.

Unparalleled flexibility to meet your clocking needs
OCX HD Master Clock offers a great variety of clocking options to suit a range of in-studio or live configurations. Outputs include Word Clock on BNC, AES/EBU and S/PDIF. This makes the OCX HD the most versatile audio master clock on the market. Additionally, OCX HD offers 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. 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. This allows for fast and easy firmware updates on the user-friendly software control panel, which is available for both OS X and Windows platforms. The desktop app provides convenient remote control, simplifying project workflow and making it easily configurable from the front panel.


  • 4th generation Acoustically Focused Clocking (AFC) jitter management algorithm
  • Sample rate support of up to 768 kHz, output of up to 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
  • Three recallable presets and control panel allowing remote control and firmware updates via USB
  • A convenient front panel lockout feature, perfect for Live Sound applications.

The new Isochrone OCX HD is shipping in February and carries a price of $1,495 US.

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