AJA IO 4K HDMI/3G-SDI Thunderbolt 2 I/O Device (Open Box)


Key Features

  • 4 x bidirectional 3G-SDI
  • 4K/UltraHD HDMI I/O
  • Simultaneous SDI and HDMI outputs
  • Realtime 4K to HD downconversion for HD-SDI and HDMI monitoring
  • 10-bit high quality 4:2:2, 4:4:4 and High Frame Rate workflow support
  • Two Thunderbolt™ 2 ports
  • Use with any Thunderbolt 2 system for up to 4K at 10-bit quality and up to 50p/60p
  • Backwards compatible with existing Thunderbolt hosts
  • 16-Channel embedded audio on SDI
  • 8-Channel embedded audio on HDMI
  • DB-25 analog audio output connector
  • XLR 12V power for battery or AC use
  • RS-422 VTR control, Reference, LTC Input
  • Headphone jack and level control for mobile environments
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This is a new “open box” item

AJA IO 4K: Powerful Mobile Thunderbolt I/O

The AJA Io 4K is the next evolution of capture and output hardware offering a full set of professional video and audio connectivity with support for the latest 4K and UltraHD devices and High Frame Rate workflows. The power of Thunderbolt 2 enables Io 4K to handle a wide range of formats from SD to HD, UltraHD and full 4K over both 3G-SDI and HDMI and support 4K frame rates up to 60p, plus HDR 10 and HLG support over HDMI for emerging HDR workflows.

Housed in a rugged chassis, Io devices are small and light enough to carry in a backpack along with a laptop, providing fully functional systems without having to transport large racks of additional gear. All Io devices are compatible with Windows or macOS, offering you the flexibility to work on your desired platform with the software of your choice.

The Io family is built to the exacting standards of all AJA hardware and backed by our world class support network, three year international warranty and advance replacement service.

Professional connectivity

Have the connectivity required for today’s variety of productions. Io 4K supports 4K, UltraHD, 3G-SDI, Dual Link, HD-SDI and SD-SDI as well as UltraHD and HD over HDMI 1.4a for both capture and output. The HDMI output is also able to accurately display HDR 10, HLG to support emerging HDR workflows.

Thunderbolt 2 technology allows even greater bandwidth between host computer systems and properly engineered Thunderbolt devices. AJA’s Io 4K takes full advantage of this improved throughput to allow capture and output of video signals from SD to 4K and everything in between.


Io 4K offers broad and futureproof support for formats all the way from SD to 4K. The realtime down-converter also means you can work at higher resolutions and easily create lower resolution deliverables without the need to recapture or re-edit.

With applicable streaming software, you can utilize all 4x 3G-SDI connections for live stream switching from multiple input sources.


HDR or High Dynamic Range, provides the ability to display a wider and richer range of colors, much brighter whites, and much deeper, darker blacks than standard signals allow. This gives your imagery a more ‘dynamic’ look and allows for natural true to life colors to be communicated to your audience.

Io 4K provides this support for your 4K/UltraHD/2K and HD HDR pipelines to HDMI compatible displays in software v12.5 and above by offering HDR 10 support with HDR Infoframe metadata, in accordance with HDMI 2.0a/CTA-861.3. Desktop Software v13 introduces HLG support over HDMI for the latest versions of Adobe Premiere CC.

Monitor 4K in HD

When working at 4K resolutions, Io 4K outputs a high quality HD-SDI down-converted signal on a dedicated BNC connector. This HD signal can be used to output 4K projects directly to HD recorders for broadcast and for easy viewing of 4K images on HD monitors during postproduction.


Thunderbolt 2 technology increases the available bandwidth that can be carried on a single Thunderbolt cable. Io 4K capitalizes on this increased capacity to allow up to 4K signals to be captured and output.

With dual Thunderbolt 2 ports, compatible with Thunderbolt 3, Io 4K can daisy chain additional devices together such as high resolution displays and high capacity storage for a complete, portable solution that’s powerful enough to meet the demands of professional production.

Extensive software support

AJA hardware is supported by an extensive list of professional software for editing, visual effects, graphics and more allowing the same AJA device to be used by many different applications on the same system. In addition, AJA provides several free applications that enable you to utilize the power of your AJA hardware even without having to run a particular software package. This allows you to create unique workflows without tying up valuable resources unnecessarily.

Integrated Audio

Embedded 16-Channel SDI and 8-Channel HDMI audio are supported as well as analog audio outputs via a standard DB-25 connection. Stereo monitoring is also possible with 2 x RCA outputs and a front panel mini-TRS headphone jack.

Sync up

Io 4K can be locked to an external reference for integration into larger productions, or feed LTC in and out to ensure footage captured with Io 4K has the proper timecode.

Machine control

An RS-422 port allows control of tape decks for frame accurate captures and layoffs.

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