What Is the UHD-402D?
The OREI UHD-402D is a 4K 4x2 HDMI matrix with downscaling, audio extraction, and Audio Return Channel support. It allows you to connect up to four HDMI source devices and route them to two HDMI displays.
The UHD-402D can send the same HDMI source to both displays or send different HDMI sources to Output A and Output B. It also includes separate audio outputs for both HDMI outputs, making it useful when you want video sent to TVs or monitors while routing audio separately to speakers, headphones, amplifiers, or sound systems.
The UHD-402D supports HDMI 2.0 and HDCP 2.2, with video resolutions up to 4K@60Hz YUV 4:4:4, HDR support, 18Gbps bandwidth, 12-bit deep color, 4K to 1080p downscaling in splitter mode, ARC support for Output A, Optical audio outputs, and 3.5mm analog stereo outputs. It supports uncompressed LPCM audio and compressed formats such as DTS, Dolby Digital, DTS-HD Master Audio, and Dolby TrueHD.
The UHD-402D is useful for home theater systems, gaming setups, offices, classrooms, conference rooms, and professional AV setups where multiple HDMI sources need to be shared between two displays.
IMPORTANT — UHD-402D Is a Matrix, Not Just a Splitter
The UHD-402D is a 4-input, 2-output HDMI matrix.
This means any of the four HDMI inputs can be routed to Output A or Output B.
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 HDMI source to multiple displays.
IMPORTANT — UHD-402D Supports 4K@60Hz, Not 8K or 4K@120Hz
The UHD-402D 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 — Audio Extraction Is Available for Both Output A and Output B
The UHD-402D includes separate audio outputs for both HDMI outputs.
It includes:
- Toslink A for Output A
- Toslink B for Output B
- Stereo A for Output A
- Stereo B for Output B
This allows audio from Output A and Output B to be routed separately to compatible audio systems.
For example, Output A can send video to one TV and audio to Toslink A, while Output B can send video to another TV and audio to Toslink B or Stereo B.
IMPORTANT — ARC Is Supported on Output A Only
The UHD-402D supports ARC on Output A.
ARC allows audio from an ARC/eARC-compatible TV connected to Output A to return to the UHD-402D and output through the Optical output.
When ARC A is turned on, the audio from Optical OUT A comes from the TV ARC port.
When ARC A is turned off, the audio from the Optical and analog outputs comes from the connected media sources.
IMPORTANT — Do Not Connect an ARC/eARC Soundbar to Output A for ARC Audio
Output A is for connecting an ARC/eARC-compatible display.
Do not connect an ARC/eARC soundbar to Output A expecting to get ARC audio.
The manual specifically states that Output A is only for displays with ARC/eARC. If you want to connect a soundbar, connect it to the Optical or analog audio outputs instead.
IMPORTANT — Downscaling Works in Splitter Mode
The UHD-402D supports 4K to 1080p downscaling when used in splitter mode.
This is useful when one HDMI source is being sent to two displays and one display supports 4K while the other supports only 1080p.
The downscaler allows 4K video to remain 4K on the 4K display while being downscaled to 1080p for the FHD display.
Downscaling does not upgrade 1080p to 4K. It only reduces 4K video to 1080p for compatibility with lower-resolution displays.
IMPORTANT — EDID Settings Affect Video, Audio, and Downscaling
The UHD-402D includes EDID DIP switches.
EDID settings help control what video and audio format the source device sends.
If you experience no video, no audio, resolution mismatch, or issues with mixed 4K and 1080p displays, changing the EDID mode may help.
For mixed 4K and 1080p displays, use one of the MIX modes depending on the audio and video needs of the setup.
Ports and Panel Layout
| Port / LED / Button | Location | Function |
| HDMI Output A / B | Rear panel | Connect two displays such as TVs, monitors, or projectors |
| HDMI Input 1–4 | Rear panel | Connect HDMI source devices such as DVD player, set-top box, gaming console, laptop, or streaming device |
| EDID DIP Switches | Rear panel | Change EDID settings |
| DC 5V / USB-C Power | Rear panel | Connect the included USB power charger and USB-A to USB-C power cable |
| Toslink A / B | Side panel | Optical audio outputs for Output A and Output B |
| Stereo A / B | Side panel | 3.5mm analog audio outputs for Output A and Output B |
| Power LED | Front panel | Lights up when the device is turned on |
| IR Window | Front panel | Receives signal from the included remote control |
| Output B LEDs 1–4 | Front panel | Shows which input is currently routed to Output B |
| Output A LEDs 1–4 | Front panel | Shows which input is currently routed to Output A |
| ARC A Button / LED | Front panel | Turns ARC mode on or off for Output A |
| Select B Button | Front panel | Switches Output B between the four connected sources |
| Select A Button | Front panel | Switches Output A between the four connected sources |
Step-by-Step Setup
- Connect the included USB power charger and USB-A to USB-C power cable to the DC 5V / USB-C power input on the UHD-402D.
- Connect your HDMI source devices to HDMI Input 1, Input 2, Input 3, and Input 4.
Examples include a laptop, Apple TV, PS4 Pro, PS3, Blu-ray player, DVD player, cable box, or streaming device. - Connect HDMI Output A to your first TV, monitor, or projector.
- Connect HDMI Output B to your second TV, monitor, or projector.
- If using audio extraction, connect your audio device to:
- Toslink A or Stereo A for audio from Output A
- Toslink B or Stereo B for audio from Output B
- Turn on the source devices, displays, audio system, and UHD-402D.
- Use the Select A and Select B buttons on the front panel to choose which source appears on each output.
- You can also use the included remote control to directly select Input 1, 2, 3, or 4 for Output A or Output B.
- If using ARC, connect an ARC/eARC-compatible TV to Output A, enable ARC on the TV, and press ARC A on the unit or remote.
- Set the EDID DIP switches based on your display and audio setup.
HDMI Cable Requirement — Critical
For best performance, use high-quality HDMI cables that support HDMI 2.0 and 18Gbps bandwidth.
Poor-quality or damaged HDMI cables may cause:
- No video output
- Flickering
- Black screen
- No audio
- HDR not working
- 4K@60Hz not displaying correctly
- ARC audio not working
- Downscaling issues
For troubleshooting, try changing the HDMI cables, lowering the source resolution, and testing the source directly with the display.
Understanding Matrix Routing
The UHD-402D allows Output A and Output B to select from any of the four HDMI inputs.
| Output | Available Input Options |
| Output A | Input 1, Input 2, Input 3, or Input 4 |
| Output B | Input 1, Input 2, Input 3, or Input 4 |
This means both displays can show the same source, or each display can show a different source.
Example:
| Output | Selected Source |
| Output A | Input 1 |
| Output B | Input 4 |
Understanding Splitter Mode
The UHD-402D can also be used like a splitter.
To do this, select the same input for both Output A and Output B.
Example:
| Output | Selected Source |
| Output A | Input 2 |
| Output B | Input 2 |
This sends the same HDMI source to both displays.
When using splitter mode with one 4K display and one 1080p display, the downscaling feature can help the 1080p display receive a compatible signal while maintaining 4K on the 4K display.
Understanding ARC Mode
ARC stands for Audio Return Channel.
On the UHD-402D, ARC is supported on Output A.
When ARC A is turned on:
- Output A should be connected to an ARC/eARC-compatible TV
- The TV sends audio back through HDMI
- Optical OUT A receives the TV ARC audio
- The ARC A LED turns on
When ARC A is turned off:
- Optical and analog audio outputs receive audio from the selected HDMI media source
ARC is useful when you want TV app audio or TV tuner audio to play through an external sound system connected to the UHD-402D.
Understanding Audio Extraction
The UHD-402D includes separate audio extraction for Output A and Output B.
| Audio Output | Corresponding HDMI Output | Best Used For |
| Toslink A | Output A | Optical soundbar, AVR, amplifier, or 5.1CH Toslink speaker system |
| Toslink B | Output B | Optical soundbar, AVR, amplifier, or 5.1CH Toslink speaker system |
| Stereo A | Output A | Headphones, powered speakers, stereo amplifier, or analog audio system |
| Stereo B | Output B | Headphones, powered speakers, stereo amplifier, or analog audio system |
Supported audio includes uncompressed LPCM and compressed formats such as DTS, Dolby Digital, DTS-HD Master Audio, and Dolby TrueHD.
The connected audio device must support the selected audio format.
If there is no sound or the audio device makes noise, set the HDMI source to a compatible audio format such as PCM stereo or a supported Dolby/DTS format.
EDID Settings
The UHD-402D includes 16 EDID modes.
0 = Switch position UP
1 = Switch position DOWN
| Mode | DIP 1 | DIP 2 | DIP 3 | DIP 4 | EDID Setting |
| Mode 1 | 0 | 0 | 0 | 0 | Copy EDID from HDMI Output A |
| Mode 2 | 0 | 0 | 0 | 1 | 1080p, 2CH Audio |
| Mode 3 | 0 | 0 | 1 | 0 | 1080p, Dolby/DTS 5.1 |
| Mode 4 | 0 | 0 | 1 | 1 | 1080p, HD Audio |
| Mode 5 | 0 | 1 | 0 | 0 | 1920x1200p, 2CH Audio |
| Mode 6 | 0 | 1 | 0 | 1 | 1920x1200p, Dolby/DTS 5.1 |
| Mode 7 | 0 | 1 | 1 | 0 | 1920x1200p, HD Audio |
| Mode 8 | 0 | 1 | 1 | 1 | 4K@60, 10.2G, HDR10, 2CH Audio |
| Mode 9 | 1 | 0 | 0 | 0 | 4K@60, 10.2G, HDR10, Dolby/DTS 5.1 |
| Mode 10 | 1 | 0 | 0 | 1 | 4K@60, 10.2G, HDR10, HD Audio |
| Mode 11 | 1 | 0 | 1 | 0 | 4K@60, 18G, HDR10, 2CH Audio |
| Mode 12 | 1 | 0 | 1 | 1 | 4K@60, 18G, HDR10, Dolby/DTS 5.1 |
| Mode 13 | 1 | 1 | 0 | 0 | 4K@60, 18G, HDR10, HD Audio |
| Mode 14 | 1 | 1 | 0 | 1 | MIX1 |
| Mode 15 | 1 | 1 | 1 | 0 | MIX2 |
| Mode 16 | 1 | 1 | 1 | 1 | MIX3 |
MIX mode behavior:
| MIX Mode | Function |
| MIX1 | Lowest format of audio/video |
| MIX2 | Highest format of audio, compose downscaler of video |
| MIX3 | Lowest format of audio, compose downscaler of video |
Use 2CH audio modes for stereo systems.
Use Dolby/DTS 5.1 modes for compatible surround sound systems.
Use HD Audio modes when using HDMI audio with a compatible AVR or advanced audio system.
Use MIX2 or MIX3 when working with mixed 4K and 1080p displays and downscaling is needed.
Understanding the Remote Control
The included remote can control source selection, audio mute, ARC, and power.
| Remote Button | Function |
| Number 1 / 2 / 3 / 4 under A | Selects the corresponding video source for Output A |
| Number 1 / 2 / 3 / 4 under B | Selects the corresponding video source for Output B |
| MUTE A | Turns Output A audio on or off |
| MUTE B | Turns Output B audio on or off |
| ARC A | Turns ARC on or off for Output A |
| PWR | Turns the matrix on or off |
Use the remote when the matrix is installed away from the main viewing position.
What Source Devices Is the UHD-402D Compatible With?
The OREI UHD-402D is compatible with HDMI source devices such as:
- Laptops
- Apple TV
- PS4 Pro
- PS3
- Blu-ray players
- DVD players
- Streaming devices
- Cable boxes
- Satellite receivers
- Set-top boxes
- Media players
- HDMI PCs
For 4K@60Hz and HDR, the source device, HDMI cable, and display must all support the selected format.
What Displays Is the UHD-402D Compatible With?
The UHD-402D can connect to HDMI displays such as:
- 4K TVs
- 1080p TVs
- Monitors
- Projectors
- Commercial displays
For ARC use, the display connected to Output A must support ARC/eARC.
For mixed 4K and 1080p display setups, use the downscaler / MIX EDID modes.
What Audio Devices Is the UHD-402D Compatible With?
The UHD-402D can send audio to:
- Optical soundbars
- 5.1CH Toslink speaker systems
- AV receivers
- Amplifiers
- Headphones
- Powered speakers
- Stereo audio systems
- HDMI TVs or AVRs through HDMI output
For Optical audio, make sure the soundbar, AVR, or speaker system supports the selected audio format.
For analog stereo audio, use a compatible stereo format such as PCM / LPCM.
Frequently Asked Questions
Q: What is the OREI UHD-402D used for?
A: The UHD-402D is used to connect up to four HDMI source devices to two HDMI displays. It can route the same or different sources to Output A and Output B, while also providing audio extraction and ARC support.
Q: Is the UHD-402D a splitter?
A: It can work like a splitter by sending the same source to both outputs, but it is more flexible because it is a 4x2 HDMI matrix.
Q: Is the UHD-402D a matrix switch?
A: Yes. It is a 4-input, 2-output HDMI matrix.
Q: Can Output A and Output B show different sources?
A: Yes. Output A and Output B can each select from Input 1, 2, 3, or 4.
Q: Can both outputs show the same source?
A: Yes. Select the same input for Output A and Output B.
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-402D support 4K@60Hz?
A: Yes. It supports video resolutions up to 4K@60Hz YUV 4:4:4.
Q: Does the UHD-402D support 8K?
A: No. The UHD-402D supports up to 4K@60Hz. It does not support 8K.
Q: Does the UHD-402D support 4K@120Hz?
A: No. It supports up to 4K@60Hz.
Q: Does the UHD-402D support HDR?
A: Yes. HDR is supported.
Q: Does the UHD-402D support downscaling?
A: Yes. It supports 4K to 1080p downscaling when in splitter mode.
Q: When should I use downscaling?
A: Use downscaling when sending a 4K source to both a 4K display and a 1080p display. The device can keep 4K on the 4K display while downscaling to 1080p for the FHD display.
Q: Does the UHD-402D have audio extraction?
A: Yes. It includes Toslink Optical and 3.5mm stereo outputs for both Output A and Output B.
Q: Does the UHD-402D support ARC?
A: Yes. ARC is supported on Output A only.
Q: How does ARC work on the UHD-402D?
A: Connect an ARC/eARC-compatible TV to Output A. When ARC A is turned on, audio from the TV ARC port is sent to Optical OUT A.
Q: Can I connect an ARC/eARC soundbar to Output A and get audio?
A: No. Output A is for displays with ARC/eARC. Connect the soundbar to the Optical or analog audio outputs instead.
Q: What happens when ARC A is off?
A: When ARC A is off, audio from the selected HDMI media source is sent to the Optical and analog audio outputs.
Q: What EDID mode should I use for mixed 4K and 1080p displays?
A: Use MIX2 or MIX3 when you need the downscaler function, depending on whether you want highest audio format or lowest audio format.
Q: How do I switch sources from the front panel?
A: Press Select A to switch the source for Output A, or press Select B to switch the source for Output B.
Q: How do I switch sources using the remote?
A: Press the number 1, 2, 3, or 4 under A for Output A, or under B for Output B.
Q: What does MUTE A do?
A: MUTE A turns Output A audio on or off.
Q: What does MUTE B do?
A: MUTE B turns Output B audio on or off.
Q: What should I do if the device is not working?
A: Check that the power adapter is firmly connected, try a different outlet, change the HDMI cables, try a lower source resolution, and check that the front LEDs are lighting up.
Q: Does the UHD-402D need external power?
A: Yes. Connect the included USB power charger and USB-A to USB-C power cable to the DC 5V input.
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