UHD-404 Overview and Use cases

What Is the UHD-404?

The OREI UHD-404 is an 18Gbps 4x4 HDMI matrix. It allows you to connect up to four HDMI source devices and route them to up to four HDMI displays.

Unlike a basic HDMI switch, the UHD-404 can send different HDMI sources to different displays. For example, Output 1 can show Input 1, while Output 2 shows Input 3, and Output 3 and Output 4 can show another source.

The UHD-404 supports HDCP 2.2 / 1.x, video resolutions up to 4K@60Hz, RGB / YCbCr 4:4:4, HDR, HDR10, HDR10+, Dolby Vision pass-through, LPCM 7.1CH, Dolby TrueHD, and DTS-HD Master Audio. It also supports 4K to 1080p downscaling, EDID management, panel control, and IR remote control. 

The UHD-404 is useful for home theater, retail displays, classrooms, conference rooms, control rooms, demo stations, and other AV setups where multiple HDMI sources need to be routed to multiple displays.

IMPORTANT — UHD-404 Is a Matrix, Not a Basic Splitter

The UHD-404 is a 4-input, 4-output HDMI matrix.

This means it can route any of the four HDMI inputs to any of the four HDMI outputs.

For example:

• Output 1 can show Input 1 
• Output 2 can show Input 2 
• Output 3 can show Input 3 
• Output 4 can show Input 4 

You can also send the same input to multiple outputs if needed.

This is different from a basic HDMI splitter, which only duplicates one source to multiple displays.

IMPORTANT — UHD-404 Supports 4K@60Hz, Not 8K or 4K@120Hz

The UHD-404 supports video resolutions up to 4K@60Hz.

It does not support 8K or 4K@120Hz.

For 8K or 4K@120Hz setups, use an HDMI 2.1 matrix or switch that supports the required bandwidth.

IMPORTANT — Each Output Can Be Switched Independently

Each HDMI output has its own control section.

This means Output 1, Output 2, Output 3, and Output 4 can each be assigned to a different HDMI input.

Use the front-panel OUT buttons or the included IR remote to choose which source appears on each display.

IMPORTANT — Downscaling Is Supported Per Output

The UHD-404 supports 4K to 1080p downscaling.

This is useful when one or more connected displays only support 1080p while other displays support 4K.

Each output has a downscaler function. Long press the corresponding output button for about 3 seconds to turn the downscaler on or off for that output.

For example, if Output 1 is connected to a 4K TV and Output 2 is connected to a 1080p TV, the downscaler can help the 1080p display receive a compatible signal.

IMPORTANT — EDID Settings Affect Video and Audio Compatibility

The UHD-404 includes EDID switch control.

EDID tells the connected HDMI source what video and audio formats the system supports.

If you experience no signal, audio issues, or resolution problems, changing the EDID setting may help.

Use 1080p EDID modes for older displays, 4K@30Hz EDID modes for HDMI 1.4 displays, and 4K@60Hz EDID modes for HDMI 2.0 displays.

IMPORTANT — UHD-404 Does Not Have Audio Extraction

The UHD-404 supports HDMI audio pass-through, but it does not include separate audio extraction ports.

There is no Optical output, 3.5mm output, RCA output, or HDMI Audio Only output on this model.

Audio passes through HDMI to the connected TV, monitor, AVR, or HDMI audio system.

Ports and Panel Layout

Step-by-Step Setup

1. Connect the included 12V/2.5A power adapter to the DC 12V port on the UHD-404. 
2. Connect your HDMI source devices to HDMI Input 1, Input 2, Input 3, and Input 4. 
   Examples include a PC, Blu-ray player, streaming device, game console, cable box, or media player. 
3. Connect HDMI Output 1, Output 2, Output 3, and Output 4 to your TVs, monitors, or projectors. 
4. Turn on the HDMI sources, displays, and UHD-404. 
5. Use the front-panel OUT buttons or the IR remote to assign each output to the desired input source. 
6. If one of the displays does not support 4K, turn on the downscaler for that output by long pressing the corresponding OUT button for 3 seconds. 
7. Set the EDID switch based on the video and audio format needed for your setup. 

HDMI Cable Requirement — Critical

For 4K@60Hz performance, use high-quality HDMI cables rated for HDMI 2.0 / 18Gbps.

Poor-quality or long HDMI cables may cause:

• No signal 
• Flickering 
• Black screen 
• Audio dropouts 
• HDCP handshake issues 
• Dolby Vision or HDR not working properly 
• 4K@60Hz not displaying correctly 

For troubleshooting, test the source directly with the display and try a shorter HDMI cable.

Understanding Matrix Routing

The UHD-404 can route any input to any output.

This means each display can show the same source or a different source.

Example setup:

You can also set all four outputs to the same input if you want all displays to show the same content.

Understanding Distribution Mode and Switching Mode

The UHD-404 supports distribution mode and switching mode.

Distribution mode is useful when the same HDMI source needs to be shown on multiple displays.

Switching mode is useful when each display may need to show a different HDMI source.

Use the front panel or remote control to select which input goes to each output.

Understanding Downscaling

The UHD-404 supports 4K to 1080p downscaling.

This helps when a 4K source is connected, but one of the displays only supports 1080p.

Each output has its own downscaler control.

Downscaling does not upgrade a 1080p signal to 4K. It only helps reduce a higher-resolution signal to a lower resolution for compatible displays.

EDID Switch Settings

The UHD-404 includes EDID switch control with the following modes:

Use a 2.0 audio EDID mode for stereo TVs or stereo systems.

Use Dolby/DTS 5.1 modes when the connected audio system supports surround sound.

Use HD Audio 7.1 modes when the connected AVR or audio system supports higher-channel HDMI audio.

Use Copy Output modes when you want the source to follow the EDID from a specific connected display.

Understanding the IR Remote

The included IR remote can control input selection for each output.

What Source Devices Is the UHD-404 Compatible With?

The OREI UHD-404 is compatible with HDMI source devices such as:

• Blu-ray players 
• DVD players 
• Gaming consoles 
• PCs 
• Laptops with HDMI output 
• Streaming devices 
• Cable boxes 
• Satellite receivers 
• Media players 
• Security DVRs 
• Set-top boxes 

For 4K@60Hz, HDR, HDR10+, or Dolby Vision, the source device, HDMI cable, and connected display must support the selected format.

What Displays Is the UHD-404 Compatible With?

The UHD-404 can connect to HDMI displays such as:

• TVs 
• Monitors 
• Projectors 
• Commercial displays 
• Classroom displays 
• Retail displays 
• Control room displays 
• Security monitoring displays 

For 4K@60Hz output, the connected display must support 4K@60Hz over HDMI.

If one display is 4K and another is 1080p, use the downscaler function for the lower-resolution display.

Frequently Asked Questions

Q: What is the OREI UHD-404 used for? 
A: The UHD-404 is used to connect up to four HDMI source devices to up to four HDMI displays. Each output can show the same source or a different source.

Q: Is the UHD-404 an HDMI splitter? 
A: It can send the same source to multiple displays, but it is more than a splitter. It is a 4x4 HDMI matrix, meaning each output can be assigned to any input.

Q: Can Output 1 and Output 2 show different sources? 
A: Yes. Each HDMI output can show a different HDMI input source.

Q: Can all four displays show the same source? 
A: Yes. You can assign the same input to all four outputs.

Q: How many HDMI sources can I connect? 
A: You can connect up to four HDMI source devices.

Q: How many displays can I connect? 
A: You can connect up to four HDMI displays.

Q: Does the UHD-404 support 4K@60Hz? 
A: Yes. It supports up to 4K@60Hz with 18Gbps bandwidth.

Q: Does the UHD-404 support 8K? 
A: No. The UHD-404 supports up to 4K@60Hz. It does not support 8K.

Q: Does the UHD-404 support 4K@120Hz? 
A: No. The UHD-404 does not support 4K@120Hz.

Q: Does the UHD-404 support Dolby Vision? 
A: Yes. The manual lists Dolby Vision pass-through support.

Q: Does the UHD-404 support HDR? 
A: Yes. It supports HDR, HDR10, and HDR10+ pass-through.

Q: Does the UHD-404 support downscaling? 
A: Yes. It supports 4K to 1080p downscaling.

Q: How do I turn downscaling on or off? 
A: Long press the OUT button for the desired output for about 3 seconds, or use the SD button on the remote.

Q: Does the UHD-404 have audio extraction? 
A: No. The UHD-404 does not have separate Optical, RCA, 3.5mm, or HDMI Audio Only outputs. HDMI audio passes through the HDMI outputs.

Q: What audio formats does the UHD-404 support? 
A: It supports HDMI audio formats including LPCM 7.1CH, Dolby TrueHD, and DTS-HD Master Audio.

Q: What EDID mode should I use? 
A: Use 1080p modes for 1080p displays, 4K@30Hz modes for HDMI 1.4 displays, 4K@60Hz modes for HDMI 2.0 displays, or Copy Output modes if you want the source to follow a specific display.

Q: How do I switch sources for each output? 
A: Short press the OUT button for the output you want to control, or use the included remote and press the desired input number under that output section.

Q: What is the SERVICE port used for? 
A: The Micro USB SERVICE port is used for firmware upgrade.

Q: What should I do if there is no video output? 
A: Check that the correct input is selected for that output, confirm the HDMI cables are connected properly, try a different HDMI cable, and check the EDID setting.