UHD-402 Overview and Use Cases – OREI

What Is the UHD-402?

The OREI UHD-402 is a 4-input, 2-output HDMI matrix switch with ARC support. It allows you to connect up to four HDMI source devices and route them to two HDMI displays.

The UHD-402 can work as both a matrix and a splitter. This means each display can show a different HDMI source, or both displays can show the same HDMI source at the same time.

The UHD-402 supports HDMI 2.0, HDCP 2.2, video resolutions up to 4K@60Hz, pixel clock rate up to 600MHz, ARC support between INPUT 4 and OUTPUT A, IR remote control, and HDMI audio formats including DTS-HD and Dolby TrueHD.

The UHD-402 is useful for home theaters, sports bars, offices, schools, conference rooms, shopping malls, hotels, museums, and setups where HDMI sources need to be shared between two rooms or two displays.

IMPORTANT — UHD-402 Is a Matrix, Not Just a Splitter

The UHD-402 is a 4-input, 2-output HDMI matrix.

This means each output can independently select one of the four HDMI inputs.

For example:

Output A can show Input 1
Output B can show Input 3

Both outputs can also show the same input if needed.

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

IMPORTANT — UHD-402 Supports 4K@60Hz, Not 8K or 4K@120Hz

The UHD-402 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 — ARC Works Between INPUT 4 and OUTPUT A

The UHD-402 supports ARC between INPUT 4 and OUTPUT A.

To use ARC:

Connect an ARC-compatible soundbar or audio system to INPUT 4
Connect the TV’s ARC HDMI port to OUTPUT A

This allows audio from the TV to return through the UHD-402 to the soundbar or audio system connected to INPUT 4.

INPUT 4 and OUTPUT A are the ARC-related ports on this model.

IMPORTANT — INPUT 4 Can Be Used for Source or ARC Soundbar

INPUT 4 has two possible uses.

In normal matrix operation, INPUT 4 can be used as a regular HDMI source input.

When using ARC, INPUT 4 is used to connect an ARC-compatible soundbar or audio system.

If INPUT 4 is being used for ARC audio, it should not also be used as a regular source input at the same time.

IMPORTANT — Use HDMI for High-Bandwidth Audio Formats

The manual notes that for HD audio formats such as Dolby TrueHD and DTS-HD Master Audio, HDMI connection should be used for audio transmission.

If the connected TV, soundbar, or home theater receiver does not support the selected audio format, you may hear noise or no sound.

For best results, make sure the connected display or audio system supports the audio format being sent by the source device.

IMPORTANT — All Connected Devices Should Support the Required Resolution and Audio Format

For best compatibility, the manual recommends that connected source devices and sink devices support the same highest resolution, color depth, and audio format.

For example, if one display only supports 1080p and the source is set to 4K, that display may not show a picture.

If using mixed displays, set the source device to a resolution and audio format supported by both displays.

Ports and Panel Layout

Port / LED / Button	Location	Function
INPUT 1	Front panel	Connect HDMI source device
Input LEDs 1–4 for ACTIVE A	Front panel	Shows which input is selected for Output A
Input LEDs 1–4 for ACTIVE B	Front panel	Shows which input is selected for Output B
DC 5V	Rear panel	Connect the included 5V/1A power adapter
OUTPUT B	Rear panel	Connect to second TV, projector, or display
OUTPUT A / ARC	Rear panel	Connect to main TV or ARC-compatible TV
INPUT 4 / ARC	Rear panel	Connect HDMI source device or ARC-compatible soundbar
INPUT 3	Rear panel	Connect HDMI source device
INPUT 2	Rear panel	Connect HDMI source device
Remote Control	Included accessory	Select input source for Output A and Output B

Step-by-Step Setup

Connect the included DC 5V/1A power adapter to the UHD-402.
Connect your HDMI source devices to INPUT 1, INPUT 2, INPUT 3, and INPUT 4.
Examples include a Blu-ray player, DVD player, PS4 Pro, satellite receiver, cable box, streaming device, or media player.
Connect OUTPUT A to your first TV, monitor, projector, or HDMI home theater system.
Connect OUTPUT B to your second TV, monitor, projector, or HDMI home theater system.
Turn on the source devices, displays, and UHD-402.
Use the remote control or manual source selection buttons to choose which input appears on Output A and Output B.
If using ARC, connect the ARC TV to OUTPUT A and connect the ARC soundbar or audio system to INPUT 4.
Enable ARC in the TV settings if needed.

HDMI Cable Requirement — Critical

For best performance, use high-quality HDMI cables that support the video resolution being used.

For 4K@60Hz, use HDMI cables capable of carrying 4K video signals.

Poor-quality or damaged HDMI cables may cause:

No picture
Flickering
Black screen
No sound
HDCP handshake issues
4K resolution not displaying
ARC audio not working properly

For troubleshooting, test the source device directly with the display and try another HDMI cable.

Understanding Matrix Mode

Matrix mode allows Output A and Output B to show different HDMI source devices.

Example:

Output	Selected Source
Output A	Input 1
Output B	Input 3

Use matrix mode when two TVs or projectors need to display different HDMI sources.

Understanding Splitter Mode

Splitter mode allows both outputs to show the same HDMI source.

Example:

Output	Selected Source
Output A	Input 2
Output B	Input 2

Use splitter mode when you want the same HDMI source to appear on two displays at the same time.

Understanding ARC Setup

ARC stands for Audio Return Channel.

On the UHD-402, ARC works through INPUT 4 and OUTPUT A.

To use ARC:

Connect the soundbar or ARC audio system to INPUT 4.
Connect the TV’s ARC HDMI port to OUTPUT A.
Enable ARC on the TV.
Select the correct sound output setting on the TV.

This setup is useful when the soundbar only has HDMI input and does not have a separate HDMI output to connect directly to the TV.

Understanding Output A and Output B Switching

Output A and Output B have separate source selection controls.

This means each output can be controlled independently.

Output A

Press the Select A key to cycle through the input sources for Output A.

The corresponding LED will light up to show which input is selected.

Output B

Press the Select B key to cycle through the input sources for Output B.

The corresponding LED will light up to show which input is selected.

The switching process is cyclic. If you continue pressing the selection key, it will move through the available inputs.

Understanding Remote Control Operation

The remote control has separate selection keys for Output A and Output B.

Use the number keys to select the input source for each output.

For example:

Press Input 1 under Output A to send Input 1 to Output A
Press Input 3 under Output B to send Input 3 to Output B

This allows each display to be controlled independently from the remote.

What Source Devices Is the UHD-402 Compatible With?

The OREI UHD-402 is compatible with HDMI source devices such as:

Blu-ray players
DVD players
PS4 Pro
Game consoles
Satellite receivers
Cable boxes
Streaming devices
Media players
Set-top boxes
HDMI PCs or laptops

For 4K@60Hz, the source device, HDMI cable, and display must all support 4K@60Hz.

What Displays Is the UHD-402 Compatible With?

The UHD-402 can connect to HDMI displays such as:

TVs
Projectors
Monitors
HDMI home theater receivers
Commercial displays

For ARC use, the TV connected to OUTPUT A must support ARC.

What Audio Devices Is the UHD-402 Compatible With?

The UHD-402 can work with HDMI audio devices such as:

HDMI soundbars
HDMI home theater receivers
HDMI AV receivers
TVs with ARC support
Projectors with HDMI input

For ARC use, connect the soundbar or ARC audio system to INPUT 4 and connect the ARC TV to OUTPUT A.

For Dolby TrueHD, DTS-HD Master Audio, or other high-bandwidth audio formats, use HDMI connection and make sure the audio device supports the selected format.

Frequently Asked Questions

Q: What is the OREI UHD-402 used for?
A: The UHD-402 is used to connect up to four HDMI source devices to two HDMI displays. Each display can show the same source or a different source.

Q: Is the UHD-402 a splitter?
A: It can work like a splitter by sending the same source to both outputs, but it is more flexible than a splitter because it is a 4x2 HDMI matrix.

Q: Is the UHD-402 a matrix switch?
A: Yes. It is a 4-input, 2-output HDMI matrix switch.

Q: Can Output A and Output B show different sources?
A: Yes. Output A and Output B can each select a different source from the four HDMI inputs.

Q: Can both outputs show the same source?
A: Yes. Both outputs can select the same HDMI input source.

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 two HDMI displays.

Q: Does the UHD-402 support 4K?
A: Yes. It supports 4K@60Hz.

Q: Does the UHD-402 support 8K?
A: No. The UHD-402 supports up to 4K@60Hz. It does not support 8K.

Q: Does the UHD-402 support 4K@120Hz?
A: No. It supports up to 4K@60Hz.

Q: Does the UHD-402 support HDCP 2.2?
A: Yes. The manual lists HDCP 2.2 support.

Q: Does the UHD-402 support ARC?
A: Yes. ARC is supported between INPUT 4 and OUTPUT A.

Q: How do I connect ARC on the UHD-402?
A: Connect your ARC-compatible soundbar or audio system to INPUT 4 and connect your TV’s ARC HDMI port to OUTPUT A.

Q: Can INPUT 4 be used as a normal HDMI input?
A: Yes, INPUT 4 can be used as a normal HDMI input when it is not being used for ARC.

Q: What audio formats does the UHD-402 support?
A: The manual lists DTS-HD and Dolby TrueHD lossless compressed digital audio support.

Q: Why am I getting no sound?
A: Check the HDMI cable connection, make sure the connected TV or audio system supports the audio format, and reset the HDMI switch if needed.

Q: Why do I hear noise from my speakers?
A: The audio format may not be supported by the connected TV, receiver, or soundbar. Set the source device to a compatible audio format.

Q: Why is 4K not showing?
A: Make sure the source device, display, and HDMI cables all support 4K video transmission.

Q: How do I switch sources manually?
A: Use the Select A button for Output A and Select B button for Output B. Each press cycles through the available inputs.

Q: How do I switch sources using the remote?
A: Use the separate Output A and Output B number keys on the remote to choose the input source for each output.

Q: Does the UHD-402 need external power?
A: Yes. Connect the included DC 5V/1A power adapter.

Q: What should I do if there is no picture?
A: Check that the source works when connected directly to the display, confirm all HDMI cables are connected properly, check whether any cable is damaged, and reset or power cycle the matrix.

Q: Can I connect a video recorder to one output?
A: The manual notes that HDCP may lock the audio portion when an output is connected to a video recorder. For protected content, recording may not work properly.