What Is the UHD-404R?
The OREI UHD-404R is a 4K@60Hz 4x4 HDMI matrix with downscaling, audio extraction, and ARC support. It allows you to connect up to four HDMI source devices and route them to up to four HDMI displays.
The UHD-404R can send different sources to different displays, or it can send the same source to multiple displays. It is useful for home theater, retail displays, classrooms, conference rooms, control rooms, sports bars, and commercial AV setups where multiple HDMI sources need to be shared across multiple screens.
The UHD-404R supports HDMI 2.0, HDCP 2.2, video resolutions up to 4K@60Hz, HDR, 18Gbps video bandwidth, 4K to 1080p downscaling in 1x4 splitter mode, ARC on Output A, and separate Optical and 3.5mm analog audio outputs for Output A and Output B. It supports uncompressed LPCM and compressed audio formats including DTS, Dolby Digital, DTS-HD Master Audio, and Dolby TrueHD.
IMPORTANT - UHD-404R Is a Matrix, Not Just a Splitter
The UHD-404R is a 4-input, 4-output HDMI matrix.
This means any HDMI input can be routed to any HDMI output.
For example:
- Output A can show Input 1
- Output B can show Input 2
- Output C can show Input 3
- Output D can show Input 4
You can also send the same HDMI input to multiple outputs if needed.
This is different from a basic HDMI splitter, which only duplicates one source to multiple displays.
IMPORTANT - UHD-404R Supports 4K@60Hz, Not 8K or 4K@120Hz
The UHD-404R 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 Output A and Output B Only
The UHD-404R includes separate audio extraction outputs for Output A and Output B.
It includes:
- Toslink / Optical A
- Toslink / Optical B
- 3.5mm Stereo A
- 3.5mm Stereo B
These audio outputs correspond to HDMI Output A and HDMI Output B.
There are no separate Optical or 3.5mm audio extraction outputs for Output C or Output D.
IMPORTANT - ARC Is Supported on Output A Only
The UHD-404R supports ARC on Output A.
ARC allows audio from an ARC/eARC-compatible TV connected to Output A to return to the UHD-404R and output through the Optical audio output.
The TV must support ARC for this function to work.
When ARC A is turned on, TV audio is output through the Optical output.
When ARC A is turned off, audio from HDMI media sources 1-4 is output through the Optical and Stereo ports.
IMPORTANT - Do Not Connect an ARC/eARC Soundbar to Output A for ARC Audio
Output A is designed to connect to an ARC/eARC TV input when using ARC.
The manual specifically states that you cannot connect an ARC/eARC soundbar to OUT A and get audio.
If you are using ARC, connect the ARC/eARC TV to Output A. Do not connect the ARC/eARC soundbar to Output A expecting it to receive ARC audio.
IMPORTANT - Downscaling Works in 1x4 Splitter Mode
The UHD-404R supports 4K to 1080p downscaling in 1x4 splitter mode.
This is useful when one source is being sent to all four displays and one or more displays only support 1080p.
The manual notes that the matrix can downscale 4K@60Hz 4:4:4, 4:2:2, and 4:2:0 HDR10 signals to 1080p.
Downscaling does not upgrade 1080p to 4K. It only reduces a 4K signal to 1080p for compatibility with lower-resolution displays.
IMPORTANT - EDID Settings Affect Video and Audio Compatibility
The UHD-404R includes EDID DIP switch settings.
EDID controls what video and audio format the source device sends.
If you experience no video, no audio, flickering, resolution mismatch, or HDR issues, changing the EDID setting may help.
Use 1080p modes for older displays, 4K@60Hz 18Gbps modes for HDMI 2.0 displays, and MIX modes when using mixed display setups.
Ports and Panel Layout
| Port / LED / Button | Location | Function |
| Power Button / ON-OFF | Rear / side panel | Turns the matrix on or off |
| Power LED | Front panel | Power LED indicator |
| IR Window | Front panel | Receives signal from the included IR remote |
| Input 1-4 | Rear panel | Connect HDMI source devices such as Blu-ray player, laptop, PS4 Pro, PS3, streaming device, or media player |
| Output A / B / C / D | Rear panel | Connect HDMI displays such as TVs, monitors, or projectors |
| EDID DIP Switch | Rear panel | Switches between EDID settings |
| Micro USB | Rear panel | Used for firmware update and RS-232 control |
| DC 12V | Rear panel | Connect the included power adapter |
| Toslink A / B | Side panel | Optical audio outputs for Output A and Output B |
| Stereo A / B | Side panel | 3.5mm analog stereo outputs for Output A and Output B |
| Input Indicators A/B/C/D 1-4 | Front panel | Shows selected input for each output |
| ARC A Button / LED | Front panel | Turns ARC mode on or off for Output A |
| Output A/B/C/D Buttons | Front panel | Switches between the four input sources for each output |
Step-by-Step Setup
- Connect the included DC 12V power adapter to the UHD-404R.
- Connect your HDMI source devices to Input 1, Input 2, Input 3, and Input 4.
Examples include a Blu-ray player, PS4 Pro, PS3, laptop, streaming device, cable box, or media player. - Connect Output A, Output B, Output C, and Output D to your TVs, monitors, projectors, or commercial displays.
- 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-404R.
- Use the front-panel Output A/B/C/D buttons or the included remote to select which input appears on each output.
- If using ARC, connect an ARC-compatible TV to Output A and turn on ARC A.
- Set the EDID DIP switches based on your display and audio setup.
- If using 1x4 splitter mode with mixed 4K and 1080p displays, use an EDID/downscaling mode that supports your display setup.
HDMI Cable Requirement - Critical
For best performance, use high-quality HDMI cables.
The manual recommends using high-quality HDMI cables under 30 feet.
Poor-quality or long HDMI cables may cause:
- No video output
- Flickering
- Black screen
- Audio dropouts
- ARC issues
- HDCP handshake issues
- 4K@60Hz not displaying correctly
- HDR not working properly
For troubleshooting, try replacing the HDMI cables, lowering the source resolution, and changing the EDID settings.
Understanding Matrix Routing
The UHD-404R allows each output to select one of 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 |
| Output C | Input 1, Input 2, Input 3, or Input 4 |
| Output D | Input 1, Input 2, Input 3, or Input 4 |
This means each display can show the same source or a different source.
Example:
| Output | Selected Source |
| Output A | Blu-ray player |
| Output B | Laptop |
| Output C | PS4 Pro |
| Output D | Streaming device |
Understanding ARC Mode
ARC stands for Audio Return Channel.
On the UHD-404R, ARC is supported on Output A.
When ARC A is turned on:
- The TV connected to Output A must support ARC
- TV audio is returned to the UHD-404R
- The returned TV audio is output through the Optical output
- The ARC A LED turns on
When ARC A is turned off:
- Audio from HDMI sources 1-4 is output through the Optical and Stereo ports
ARC is useful when you want audio from TV apps or the TV’s internal tuner to play through an external audio system connected through Optical.
Understanding Audio Extraction
The UHD-404R includes audio extraction for Output A and Output B.
| Audio Output | Corresponding HDMI Output | Best Used For |
| Toslink A | Output A | Soundbar, AVR, amplifier, or Optical audio system |
| Toslink B | Output B | Soundbar, AVR, amplifier, or Optical audio system |
| Stereo A | Output A | Powered speakers, headphones, or analog stereo input |
| Stereo B | Output B | Powered speakers, headphones, or analog stereo input |
Supported audio formats include:
- LPCM
- DTS
- Dolby Digital
- DTS-HD Master Audio
- Dolby TrueHD
The connected audio device must support the format being sent by the source.
If there is no audio or you hear noise, set the source device to a compatible audio format such as PCM stereo or a supported Dolby/DTS format.
EDID Settings
The UHD-404R includes 16 EDID modes.
0 = Switch Up
1 = Switch 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@60Hz, 10.2G, HDR10, 2CH Audio |
| Mode 9 | 1 | 0 | 0 | 0 | 4K@60Hz, 10.2G, HDR10, Dolby/DTS 5.1 |
| Mode 10 | 1 | 0 | 0 | 1 | 4K@60Hz, 10.2G, HDR10, HD Audio |
| Mode 11 | 1 | 0 | 1 | 0 | 4K@60Hz, 18G, HDR10, 2CH Audio |
| Mode 12 | 1 | 0 | 1 | 1 | 4K@60Hz, 18G, HDR10, Dolby/DTS 5.1 |
| Mode 13 | 1 | 1 | 0 | 0 | 4K@60Hz, 18G, HDR10, HD Audio |
| Mode 14 | 1 | 1 | 0 | 1 | MIX1 - Lowest format of audio and video |
| Mode 15 | 1 | 1 | 1 | 0 | MIX2 - Highest format of audio, downscale video |
| Mode 16 | 1 | 1 | 1 | 1 | MIX3 - Lowest format of audio, downscale 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 MIX modes when working with mixed display or audio capabilities.
Understanding Downscaling
The UHD-404R supports 4K to 1080p downscaling in 1x4 splitter mode.
This helps when sending one source to multiple displays where some displays are 4K and others are 1080p.
The manual states the matrix can downscale 4K@60Hz 4:4:4, 4:2:2, and 4:2:0 HDR10 signals to 1080p.
If one connected display does not show video while others work, use the MIX EDID modes or lower the source resolution.
RS-232 Control
The UHD-404R supports RS-232 control through the Micro USB port.
Default RS-232 settings:
| Setting | Value |
| Baud Rate | 57600 |
| Data Bits | 8 |
| Stop Bits | 1 |
| Parity | None |
| Flow Control | None |
The Micro USB port can be used for configuration and third-party control systems.
RS-232 commands can control:
- Power on/off
- Global system status
- Output-to-input routing
- EDID mode
- Optical and analog audio output enable/disable
- ARC on/off for Output A
- Front-panel lock
- RS-232 baud rate
- Factory reset
Understanding the Remote Control
The included remote can control power, ARC, audio mute, and source selection.
| Remote Button | Function |
| Power | Turns the matrix on or off |
| ARC A | Turns ARC function on or off for Output A |
| Output A 1/2/3/4 | Selects the source for Output A |
| Output A Mute | Turns Output A audio on or off |
| Output B 1/2/3/4 | Selects the source for Output B |
| Output B Mute | Turns Output B audio on or off |
| Output C 1/2/3/4 | Selects the source for Output C |
| Output D 1/2/3/4 | Selects the source for Output D |
What Source Devices Is the UHD-404R Compatible With?
The OREI UHD-404R is compatible with HDMI source devices such as:
- Blu-ray players
- DVD players
- PS4 Pro
- PS3
- Gaming consoles
- Laptops with HDMI output
- Desktop PCs
- Streaming devices
- Cable boxes
- Satellite receivers
- Media players
- Set-top boxes
For 4K@60Hz and HDR, the source device, display, and HDMI cables must all support the selected format.
What Displays Is the UHD-404R Compatible With?
The UHD-404R can connect to HDMI displays such as:
- 4K TVs
- 1080p TVs
- Monitors
- Projectors
- Commercial displays
- Control room displays
- Retail displays
- Conference room displays
For ARC use, the TV connected to Output A must support ARC.
For mixed 4K and 1080p displays in splitter mode, use the downscaler or MIX EDID modes.
What Audio Devices Is the UHD-404R Compatible With?
The UHD-404R can send audio to:
- Optical soundbars
- AV receivers
- Amplifiers
- Powered speakers
- Headphones
- Stereo audio systems
- HDMI TVs or AVRs through HDMI output
For ARC audio, connect an ARC-compatible TV to Output A and use the Optical output for returned TV audio.
Frequently Asked Questions
Q: What is the OREI UHD-404R used for?
A: The UHD-404R is used to connect up to four HDMI source devices to up to four HDMI displays. It also supports audio extraction for Output A and Output B, ARC on Output A, and 4K to 1080p downscaling in 1x4 splitter mode.
Q: Is the UHD-404R a matrix?
A: Yes. It is a 4-input, 4-output HDMI matrix.
Q: Is the UHD-404R a splitter?
A: It can be used like a splitter by sending the same source to multiple outputs, but it is more flexible than a splitter because each output can select a different source.
Q: Can each output show a different source?
A: Yes. Output A, B, C, and D can each select Input 1, 2, 3, or 4.
Q: Can all four displays show the same source?
A: Yes. You can route 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-404R support 4K@60Hz?
A: Yes. It supports video resolutions up to 4K@60Hz.
Q: Does the UHD-404R support 8K?
A: No. The UHD-404R supports up to 4K@60Hz. It does not support 8K.
Q: Does the UHD-404R support 4K@120Hz?
A: No. It supports up to 4K@60Hz.
Q: Does the UHD-404R support HDR?
A: Yes. HDR is supported.
Q: Does the UHD-404R have audio extraction?
A: Yes. It includes Optical and 3.5mm analog audio outputs for Output A and Output B.
Q: Does Output C or Output D have separate audio extraction?
A: No. Separate Toslink and 3.5mm audio outputs are available only for Output A and Output B.
Q: Does the UHD-404R support ARC?
A: Yes. ARC is supported on Output A.
Q: Can I connect an ARC/eARC soundbar to Output A and get audio?
A: No. The manual states that Output A only accepts an ARC/eARC TV input for ARC use.
Q: How does ARC work on this model?
A: Connect an ARC-compatible TV to Output A. When ARC A is on, TV audio is returned and output through the Optical output.
Q: What happens when ARC is off?
A: When ARC is off, audio from media sources 1-4 is output through the Optical and Stereo ports.
Q: Does the UHD-404R support downscaling?
A: Yes. It supports 4K to 1080p downscaling in 1x4 splitter mode.
Q: What EDID mode should I use for mixed 4K and 1080p displays?
A: Use MIX2 or MIX3 when you need downscaling, depending on whether you want the highest audio format or lowest audio format.
Q: What HDMI cable length is recommended?
A: The manual recommends using high-quality HDMI cables under 30 feet.
Q: How do I switch sources?
A: Use the front-panel Output A/B/C/D buttons or the included remote control.
Q: What is the Micro USB port used for?
A: It is used for firmware updates and RS-232 control.
Q: What is the default RS-232 baud rate?
A: The default baud rate is 57600.
Q: What should I do if there is no video output?
A: Try replacing the HDMI cables, lowering the resolution from the input source, changing the EDID settings, and checking whether all outputs are affected.
Q: Does the UHD-404R need external power?
A: Yes. Connect the included DC 12V power adapter.
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