Antelope Audio

Isochrone OCX HD

Introduced 2016$1,895 MSRP

The Isochrone OCX HD is Antelope Audio's flagship standalone master clock generator, built around a 4th-generation 64-bit Acoustically Focused Clocking (AFC) engine and an oven-controlled crystal oscillator, with an optional input for syncing to Antelope's 10MX rubidium atomic clock for even greater long-term stability. Designed for mastering, recording, and post-production environments, it distributes ultra-low-jitter word clock, AES/EBU, and S/PDIF timing references to an entire digital audio chain at sample rates up to 768 kHz.

MSRP

$1,895

Used market · Good

$1,275

-33% vs MSRP

as of Sep 1, 2026

Sell or trade this Add to my system

MSRP to used market

From $1,895 at launch to $1,275 today.

Specifications

Price: $1,895
Weight: 2.65 kg / 5.84 lb
Control: Software Control Panel for macOS and Windows; front-panel ergonomic controls with 3 recallable presets
Price new: $1,895
Dimensions: 482.6 x 44 x 230 mm / 19 x 1.75 x 9.05 in
Clock inputs: 2 Word Clock inputs, 10 MHz input for Antelope 10MX atomic clock sync, Universal Video Sync input
Power supply: AC universal input 100–240V, 10W max
Clock outputs: 10 configurable-in-pairs Word Clock outputs (BNC), 4 AES/EBU outputs, 2 S/PDIF outputs
Available since: March 2016
Maximum sample rate: 768 kHz over Word Clock
Dimensions w x h x d: 482.6 x 44 x 230 mm / 19 x 1.75 x 9.05 in
Core clocking technology: 64-bit Acoustically Focused Clocking (AFC) jitter-management algorithm with oven-controlled crystal oscillator