Loading... Please wait...

Our Newsletter

Antelope Isochrone OCX-HD

  • Image 1
  • Image 2
  • Image 3
  • Image 4
  • Image 5
  • Image 6
Free Shipping

Product Description


768 kHz HD Master Clock


The perfect solution for mastering, recording and project studios, film-scoring, post-production and live sound

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.



Antelope's 4th-generation AFC jitter management algorithm

Sample rate support up to 768kHz

Output of 5 distinct sample rates enabled by onboard multipliers and dividers

Additional connectivity via 4 AES/EBU, 2 S/PDIF clocking outputs (up to 192kHz)

Comprehensive audio gearboxing

Universal video input (BNC connector)

Atomic clock input for optimized accuracy and calibration

3 recallable presets

Control panel Rate Lock protects your settings while in session

User-friendly front panel control



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.



All that you love about Antelope’s cult Trinity Master Clock now in just 1U.

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.



Access all OCX HD features via Antelope Audio’s flexible software control panel

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.



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


30 – 80% RH non-condensing


Clocking System

4th Generation Acoustically Focused Clocking

64-bit DDS

Oven Controlled Crystal Oscillator


Clock Calibration

< +/-0.001 ppm


Clock Stability

<+/- 0.02 ppm, oven controlled at 64.5 C/148.1 F


Clock Aging

< 1 ppm per year


Atomic Clock Input

1 x 10M Atomic Clock Input @ 75 Ohms 3Vpp on BNC


Sample Rates (kHz)

32, 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384, 768 (kHz)


Operating Temperature

0 – 50°C, 32-122°F



2.65 kg/5.84 lb



482.6 (W) х 230 (D) х 44 (H) mm

19 (W) x 9.05 (D) x 1.75 (H) inch


Power Supply

AC Universal Input ~95-245V, 20 Watts Max


System Requirements


OS: Windows 7/8/8.1/10

Disk Space: Minimum 512 MB available disk space

USB: 1x USB 2.0 Port

Required USB bandwidth (for firmware update): 80%-90%

CPU: Intel or AMD equivalent CPU with at least 2GHz operating frequency

Memory (RAM): 4GB Minimum (8GB or more Recommended)



OS X: 10.9/10.10/10.11/10.12 (Sierra Recommended)

Disk Space: Minimum 512 MB available disk space

USB: 1x USB 2.0/3.0 Port

Required USB bandwidth: 80%-90%

Memory(RAM): 4GB Minimum (8GB or more recommended)

CPU: Intel Core 2 Duo (Minimum) Intel Core i3 ™ or higher (Recommended)

Additional Info: Internet connection required for product activation.

Product Videos

Isochrone OCX HD Master Clock | Antelope Audio (02:29)
OCX HD supports up to 768 kHz sample rate, features our best-in-class Acoustically Focused Clocking (ACF) technology and oven-controlled crystal oscillator – in just 1U rack space! For over a decade now Antelope Audio's legendary line of clocking products has been dominating the audio world. Isochrone OCX HD raises the bar in the industry once again delivering sample rate up to 768 kHz, Antelope Audio's 4th generation ACF jitter management algorithm and oven-controlled crystal oscillator. The flawless Antelope Audio clocking technology here is accompanied by a vast array of connectivity options. The product offers 10 configurable in pairs World Clock outputs on BNC, four AES/EBU outputs and two on S/PDIF. Clock distribution is additionally available through two World Clock inputs. OCX HD also allows a Video Sync input, compatible with a huge variety of SD and HD formats. Just like Antelope's Trinity Master Clock, OCX HD allows pulling up and down sample rates and syncing with our newest 10MX Rubidium Atomic Clock. Being a part of the new-generation Antelope Audio products OCX HD benefits from fast firmware updates. The user-friendly software control panel is available for both OS X and Windows, and features convenient options like front panel lock-out suitable for live sound applications. In OCX HD our signature digital clarity meets the smoothness of analog sound for yet another time. Find Isochrone OCX HD here: http://antelopeaudio.com/products/ocx-hd/ Never miss an update from Antelope Audio: https://facebook.com/AntelopeAudio http://twitter.com/AntelopeAudio
  • Isochrone OCX ...
    OCX HD supports up to 768 kHz sample rate, features our best-i...

Find Similar Products by Category

Write your own product review

Product Reviews

This product hasn't received any reviews yet. Be the first to review this product!

Add to Wish List

Click the button below to add the Antelope Isochrone OCX-HD to your wish list.

You Recently Viewed...