Closs HDMI Splitter 1-in-4 4K@30Hz Aluminum 4-Port HDMI Mirroring for TVs & Monitors

Closs 1-in-4 HDMI Splitter mirrors a single HDMI source to four displays in 4K@30Hz with plug-and-play setup and aluminum housing for stable operation.

Whether you want the same video on multiple TVs, replicate a presentation across several conference-room screens, or share gameplay on several monitors, this Closs HDMI splitter copies one HDMI input to four identical outputs. It supports 4K@30Hz and Full HD formats, common audio codecs, and works with a wide range of HDMI devices. The unit requires external USB power for reliable performance and features a metal case to help with heat dissipation during extended use.

How do I set up the Closs HDMI splitter quickly?

Setup is straightforward and requires no special drivers. Connect the provided USB power cable first, plug your source device into the input, then attach up to four HDMI cables to your displays; the same image will appear on every connected screen immediately.

• Use the included USB power cable for stable signal delivery.
• Connect your HDMI source (e.g., streaming stick, console) to the input port.
• Attach up to four HDMI outputs to TVs, monitors, or projectors.
• No software or configuration needed — purely plug-and-play.

What resolutions and audio formats are supported?

The Closs splitter handles up to 3840×2160 at 30Hz (4K@30Hz) and is backward compatible with 1080p, 720p, and 480p. It also supports common high-quality audio streams so you won’t lose multichannel or lossless formats when mirroring content.

• 4Kx2K UHD at 30Hz for high-resolution displays.
• Full HD 1080p@60Hz, 720p, and 480p supported.
• Compatible with DTS-HD, Dolby TrueHD, Dolby Digital (AC3), DSD, and more.
• Mirrors identical audio/video to all connected outputs.

Which devices and scenarios work best with this splitter?

It’s compatible with HDMI 1.4–1.0 sources and most modern HDMI displays, making it suitable for streaming sticks, game consoles, Blu-ray players, cable boxes, and projectors. Keep in mind it mirrors the input feed to all outputs — it doesn’t create independent extended screens.

• Input sources: Fire Stick, Roku, PS4/PS5, Xbox, Blu-ray, cable boxes.
• Output devices: 4K HDTVs, monitors, projectors, and training-room displays.
• Ideal for retail displays, classrooms, multiroom viewing, and live events.
• Not suitable when you need separate content on each screen (no extended desktop).

How reliable is the hardware and power requirement?

The Closs splitter uses a sturdy aluminum shell to help dissipate heat and maintain signal stability during prolonged use. Reliable operation requires the included USB power cable; without external power some connected displays may not sync or may show intermittent dropouts.

• Durable aluminum housing reduces thermal buildup.
• USB-powered for consistent performance across four outputs.
• Designed to run continuously for presentations or displays.
• Includes the HDMI splitter, USB power cable, and user manual.

Who this is for: The Closs 1x4 HDMI splitter is well suited for small businesses, educators, event hosts, and home users who need to show the same high-definition video and audio on multiple screens simultaneously. Choose this unit if you want a compact, metal-cased, plug-and-play solution for mirroring a single HDMI source across up to four displays — especially when 4K@30Hz or preserved multichannel audio is important. If you need separate content on each monitor, consider a matrix switch or multi-output graphics solution instead.