Key Features
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80 x 12G‑SDI inputs with standards conversion and frame sync on every input
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48 x 12G‑SDI aux outputs plus USB‑C webcam output for streaming
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4 mix/effects (M/E) rows with 4 DVEs each and 2 SuperSource processors (12 DVEs total)
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16 ATEM Advanced Chroma Keyers and 4 Ultra HD multiview outputs (up to 16 windows each)
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Built-in Fairlight audio mixer with up to 156 channels, MADI I/O, EQ, dynamics, and talkback
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4 integrated media players for stills and animated graphics
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Compact 4RU rack design with integrated front-panel control
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Optional hardware panels and full software control via Ethernet
Estimated reading time
Estimated reading time: ~4 minutes
Summary (3 Key Benefits)
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Ultimate 4K performance – 80 standards-converted SDI inputs and 48 outputs for maximum production flexibility.
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Complete broadcast solution – Advanced keying, multilayer DVEs, and real-time media playback in Ultra HD.
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Professional audio & control – Fairlight mixer, talkback, and multiple hardware/software control options.

The ATEM 4 M/E Constellation 4K Plus is a high-end Ultra HD live production switcher designed for demanding broadcast environments and large-scale live events.
With massive input/output capacity, advanced effects, and real-time Ultra HD processing, it is the ultimate all-in-one solution for professional productions.

Features & Design
Four independent M/E rows, two SuperSource processors, and built-in DVEs allow complex multilayer live compositions. All 80 SDI inputs have standards conversion and frame sync, while 48 programmable aux outputs give maximum routing flexibility.
The 4RU rack design integrates a front-panel with LCD, and control can be expanded via software or ATEM Advanced Panels.
Performance in Practice
Perfect for concerts, sports, and hybrid events, the 4K Plus handles large multi-camera setups with ease. The integrated Fairlight mixer provides professional audio quality, and media players allow real-time playback of stills and animated graphics.
Advantages & Disadvantages
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✔ Advantages |
✘ Disadvantages |
✔ Extreme I/O capacity with standards conversion on every input |
✘ Large 4RU size and higher price level |
✔ Built-in media players and multilayer DVE for advanced graphics |
✘ Requires experienced operators to use full potential |
✔ Professional Fairlight audio mixer with talkback system |
✘ Limited customization of multiview overlays |
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Technical Specifications
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Video Inputs:
80 x 12G‑SDI (720p, 1080i, 1080p, 2160p) with standards and frame-rate conversion
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Video Outputs:
48 x 12G‑SDI aux outputs, 4 Ultra HD multiview outputs (up to 16 sources per multiview), USB‑C webcam output (720p–1080p)
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DVEs & SuperSource:
4 DVEs per M/E row (16 total) + 2 SuperSource processors (12 DVEs total available)
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Keyers:
16 upstream ATEM Advanced Chroma Keyers + 4 downstream keyers
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Media Players:
4 players for stills and animated graphics
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Audio:
Fairlight audio mixer with up to 156 channels, MADI I/O, balanced analog inputs, and XLR talkback
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Multiview:
4 configurable Ultra HD multiview outputs with up to 16 routable sources each
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Control:
Integrated front panel, software via Ethernet, and optional hardware panels
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Physical:
4RU rackmount design, fan-cooled for extended live operation
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