StarTech ST128HD20 1x8 HDMI 2.0 Splitter — 4K/60Hz 8-Port Signal Distributor

Overview

The StarTech ST128HD20 is a commercial-grade 1-in-8-out HDMI splitter engineered to distribute a single 4K/60Hz source signal to eight displays simultaneously — with full audio and color fidelity intact across every output. At 18Gbps bandwidth over HDMI 2.0b, it handles everything a modern 4K source can throw at it: 4:4:4 chroma subsampling, HDCP 2.2 encrypted content, and 7.1 surround sound pass-through. This is the right device for video distribution environments where consistency matters — digital signage arrays, command center video walls, training room displays, or boardroom AV systems where every screen must mirror the source exactly.

Physically, the ST128HD20 is compact at 10.2 × 4.3 × 1.4 inches and weighs just 1.7 lb — rack-shelf friendly or flat-surface deployable without requiring a dedicated rack unit of its own. It draws only 15W from the included AC adapter, making it easy to fit into existing power budgets. Browse the full StarTech AV and connectivity line for compatible cables and accessories.

Key Features

• 4K/60Hz on All 8 Outputs: The 18Gbps HDMI 2.0b backbone sustains 3840×2160 resolution at 60 frames per second across every port simultaneously — no downscaling, no frame-rate compromise. If your source is 4K/60Hz, every display sees 4K/60Hz. This matters in video wall and multi-monitor control room builds where frame-rate inconsistency creates visible tearing across adjacent screens.
• 4:4:4 Chroma Subsampling: Full chroma sampling means no color compression artifacts — critical when distributing presentation graphics, medical imaging, or high-contrast UI content where color accuracy is non-negotiable. Subsampled signals (4:2:0 or 4:2:2) introduce visible banding on solid-color gradients; 4:4:4 eliminates that.
• HDCP 2.2 Compliance: Supports the current content protection standard required for 4K streaming platforms and Blu-ray Ultra HD playback. Without HDCP 2.2, a splitter will either downgrade the signal or block it entirely when protected content is detected — the ST128HD20 handles both source and display handshakes correctly at 4K.
• 7.1 Surround Sound Pass-Through: Audio follows the video signal to all eight outputs without a separate audio extractor. Command centers, simulation environments, and AV installations with discrete speakers per display get the full 7.1 channel map without additional processing hardware in the chain.
• Single HDMI Input, Eight Outputs: One source — media player, PC, set-top box, camera recorder — drives up to eight displays. For digital signage deployments with uniform content zones, this eliminates the need for a dedicated media player per screen, reducing both hardware cost and failure points.
• Wide Input Voltage (100–240V AC): The included AC adapter accepts any mains voltage globally, so the unit deploys internationally without a step-down transformer. Useful for enterprise AV teams managing installations across multiple countries or regions.
• 15W Power Consumption: At 15W total draw, the ST128HD20 adds negligible load to any AV rack's power strip or UPS. For comparison, a single active PoE camera on a midrange switch draws more. Budget-conscious rack power planning gets an easy win here.
• Compact Form Factor (10.2 × 4.3 × 1.4 in, 1.7 lb): Fits on a rack shelf, inside an AV credenza, or behind a display mount. The 1.4-inch height means it occupies less than 1U of vertical space even when shelf-mounted. Consider pairing with AV rack accessories for clean integration.
• Operating Temperature 0–45°C: Rated for standard commercial indoor environments. Not suitable for unheated equipment rooms or outdoor enclosures — plan accordingly in mechanical rooms or warehouses where ambient temps can spike.

Integration and Compatibility

The ST128HD20 is source-agnostic: any HDMI 2.0 or earlier device feeds the input — 4K media players, gaming consoles, UHD Blu-ray players, 4K-capable PCs, or HDMI-out encoders from a network video recorder. On the output side, any HDMI-compatible display works, including 4K TVs, commercial monitors, projectors, and video wall processors. The splitter duplicates the signal rather than extending or switching it — all outputs receive the identical image and audio at all times. There is no output-independent switching or PiP capability. Ensure all downstream displays support HDCP 2.2 if the source is playing protected 4K content; a single non-compliant display in the chain does not suppress the other outputs but may show a blank screen on that specific port.

Frequently Asked Questions

Q: Does the ST128HD20 support 4K at 60Hz on all eight outputs simultaneously?

A: Yes. The ST128HD20 operates at 18Gbps over HDMI 2.0b and delivers 3840×2160 at 60Hz with 4:4:4 chroma subsampling to all eight HDMI outputs at the same time — no per-port bandwidth sharing or resolution downgrade.

Q: Is HDCP 2.2 supported for protected 4K content?

A: Yes, the ST128HD20 is HDCP 2.2 compliant. It handles the handshake required for 4K Ultra HD Blu-ray and 4K streaming sources. Each connected display must also be HDCP 2.2 capable — a non-compliant display on one output will not affect other outputs, but that specific port will not display the protected content.

Q: Does the ST128HD20 pass audio to all outputs?

A: Yes. It passes 7.1 surround sound audio through HDMI to all eight outputs simultaneously alongside the video signal. No separate audio extractor or splitter is needed.

Q: Can the ST128HD20 be used to switch between multiple sources?

A: No. The ST128HD20 is a signal splitter, not a matrix switch. It has one HDMI input and duplicates that single source to all eight outputs. For multi-source routing, you would need a separate HDMI matrix switch upstream.

Q: What is the warranty on the ST128HD20?

A: The ST128HD20 carries a 2-year manufacturer warranty.

Q: What are the operating temperature limits for the ST128HD20?

A: The unit is rated for 0°C to 45°C (32°F to 113°F) operating temperature. It is designed for standard commercial indoor environments and is not rated for outdoor or high-heat industrial locations.

Ted Perry

The ST128HD20 is one of those devices that solves a specific infrastructure problem cleanly. The 18Gbps HDMI 2.0b backbone delivering 4:4:4 chroma at 4K/60Hz across all eight outputs is the spec that separates this from cheaper splitters that quietly downsample color or drop to 30Hz to stay within their bandwidth ceiling — problems you typically discover only after the install is complete and the client is standing in front of the displays.

Technical Highlights:

• 18Gbps Full-Bandwidth HDMI 2.0b: Sustains the full 4K/60Hz signal at 4:4:4 chroma with no per-port compromise — all eight outputs run at spec simultaneously, not in a shared-bandwidth round-robin.
• HDCP 2.2 on Input and Output: Handles protected 4K content correctly at both ends of the chain, preventing the blank-screen failures that plague older splitters when a modern UHD source detects a non-compliant downstream device.
• 7.1 Audio Pass-Through: Eliminates the need for a separate audio distribution amp in installations where each display has its own audio system — the full 7.1 channel map rides the HDMI signal to every output.

Deployment Considerations:

• The 0–45°C operating range is fine for conditioned AV rooms and server closets with active cooling, but verify ambient temperatures in equipment credenzas or enclosed AV furniture — passive enclosures can exceed 45°C quickly with multiple devices running.
• This is a 1-to-8 duplicator only — all outputs mirror the source identically. If any display in the intended setup needs independent content or source switching, a matrix switch upstream of the ST128HD20 is required; the splitter itself has no switching capability.

For a corporate briefing center or command room deploying eight displays from a single 4K source — video wall controller output, UHD media server, or 4K presentation PC — the ST128HD20 delivers the full signal chain without compromise and at a power draw (15W total) that won't register on any rack UPS budget.