What Is the UHDS-104A?
The OREI UHDS-104A is a 1x4 HDMI 2.0 splitter with scaler and audio extraction. It takes one HDMI source and distributes the same signal to four HDMI displays at the same time.
The HDMI source connects to HDMI IN, and up to four TVs, monitors, or projectors connect to HDMI OUT 1 through HDMI OUT 4. The unit also includes OPTICAL OUT and L/R OUT for extracting audio from the HDMI input signal.
The UHDS-104A supports HDMI 2.0b and HDCP 2.2 / 1.4, with video bandwidth up to 18Gbps. It supports video resolutions up to 4K@50/60Hz 4:4:4, 1080p, and 720p. It also supports 4K to 1080p downscaling, AUTO / COPY EDID management, optical audio output, 3.5mm analog audio output, and HDMI audio formats including LPCM, Dolby Digital, Dolby Digital Plus, Dolby TrueHD, DTS, DTS-HD Master Audio, and DSD. The application diagram shows one DVD or Blu-ray player connected to HDMI IN, four UHD TVs connected to HDMI OUT 1–4, an amplifier connected to OPTICAL OUT, and speakers connected to L/R OUT.
The UHDS-104A is useful for home theaters, classrooms, conference rooms, retail displays, restaurants, bars, churches, digital signage, AV racks, and setups where one HDMI source needs to be shown on four displays while also sending audio to an amplifier or speakers.
IMPORTANT — UHDS-104A Is a 1x4 HDMI Splitter
The UHDS-104A duplicates one HDMI source to four HDMI outputs.
| Function | Support |
| 1 HDMI input | Supported |
| 4 HDMI outputs | Supported |
| Same source on all displays | Supported |
| Different source on each display | Not supported |
| Matrix switching | Not supported |
| Extended desktop creation | Not supported |
| Audio extraction | Supported |
| Downscaling | Supported |
This product mirrors one HDMI source. It does not create independent video outputs and does not extend a PC desktop across four screens.
IMPORTANT — Supports 4K@60Hz 4:4:4
The UHDS-104A supports video resolutions up to 4K@50/60Hz 4:4:4.
| Feature | Support |
| 4K@50/60Hz 4:4:4 | Supported |
| 4K@30Hz | Supported |
| 4K@24Hz | Supported |
| 1080p@50/60Hz | Supported |
| 720p@50/60Hz | Supported |
| HDMI 2.0b | Supported |
| HDCP 2.2 / 1.4 | Supported |
| Video bandwidth | 18Gbps |
To get 4K@60Hz 4:4:4, the HDMI source, HDMI cables, connected displays, and EDID / downscaling settings must support the required signal.
IMPORTANT — 4K to 1080p Downscaling Is Supported
The UHDS-104A supports video downscaling from 4K to 1080p.
| Dial Switch | Function |
| OFF | Signal input and output are in pass-through status |
| ON | Input signal is downscaled from 4K to 1080p, then output |
This is useful when a 4K source is connected to one or more 1080p displays.
If a 1080p display shows no signal when using a 4K source, turn the 4K to 1080p dial switch ON.
IMPORTANT — Audio Extraction Is Supported
The UHDS-104A can extract audio from the HDMI input signal.
| Audio Output | Function |
| OPTICAL OUT | Sends extracted digital audio to an amplifier or audio receiver |
| L/R OUT | Sends extracted analog stereo audio to speakers or audio device |
This makes the UHDS-104A useful when the HDMI source needs to play on multiple displays while audio is sent separately to a sound system.
IMPORTANT — Analog Audio Output Supports PCM 2.0
The L/R OUT port supports analog PCM 2.0 audio.
| Port | Supported Audio |
| L/R OUT | PCM 2.0 |
If analog audio does not work from the 3.5mm output, set the HDMI source audio output to PCM / Stereo.
IMPORTANT — Optical Audio Supports Multiple Formats
The OPTICAL OUT port supports digital audio formats including:
| Optical Audio Format Support |
| LPCM 2.0 / 2.1CH |
| Dolby 5.1 |
| Dolby TrueHD |
| Dolby Digital Plus |
| DTS 5.1 |
| DTS-ES 6 |
| DTS-HDMA 5.1 |
| DTS HD-HRA 5.1 |
The connected amplifier, soundbar, or audio receiver must also support the selected audio format.
IMPORTANT — AUTO and COPY EDID Modes Are Included
The UHDS-104A includes an EDID DIP switch with AUTO and COPY modes.
| EDID Mode | Function |
| AUTO | Compares the EDID of displays connected to HDMI OUT 1–4 and sends optimal EDID information to the source |
| COPY | Copies the EDID of the display connected to HDMI OUT 1 to the source |
Use COPY mode when HDMI OUT 1 is the main display and should control the source output.
Use AUTO mode when multiple displays have different capabilities and you want the unit to choose a compatible EDID.
IMPORTANT — EDID Copy Priority Uses OUT 1 First
In COPY mode, the UHDS-104A copies EDID from HDMI OUT 1.
If no EDID is detected on OUT 1, it will copy EDID from OUT 2, OUT 3, or OUT 4.
| EDID Copy Priority |
| OUT 1 first |
| OUT 2 second |
| OUT 3 third |
| OUT 4 fourth |
For best results, connect the main or most capable display to HDMI OUT 1.
IMPORTANT — This Product Shows the Same Source on All Displays
The UHDS-104A sends the same HDMI input to all connected outputs.
| Display Behavior | Support |
| Same video on all displays | Supported |
| Same HDMI source on all outputs | Supported |
| Different content per display | Not supported |
| Independent display arrangement | Not supported |
If a laptop or PC is connected, the splitter mirrors the same screen. It does not create four separate extended monitors.
Ports and Panel Layout
| Port / Indicator / Switch | Function |
| POWER LED | Blue LED turns on when the device is powered |
| HDMI IN LED | Blue LED turns on when HDMI IN receives signal |
| HDMI OUT 1–4 LEDs | Corresponding blue LED turns on when that output is connected and outputting signal |
| SERVICE | Micro-USB firmware update port, manufacturer use only |
| EDID DIP Switch | Selects AUTO or COPY EDID mode |
| 4K → 1080P Dial Switch | Turns downscaling ON or OFF |
| HDMI OUT 1–4 | Connect HDMI displays |
| OPTICAL OUT | Connect amplifier, soundbar, or audio receiver |
| L/R OUT | Connect speakers or analog audio device |
| HDMI IN | Connect HDMI source such as DVD player, Blu-ray player, or PS5 |
| DC 5V | Connect DC 5V power adapter |
Step-by-Step Setup
- Connect the HDMI source device to HDMI IN on the UHDS-104A.[Text Wrapping Break]Examples include a Blu-ray player, DVD player, PS5, cable box, satellite receiver, streaming device, laptop, desktop PC, DVR, NVR, or HDMI matrix output.
- Connect HDMI OUT 1 to the first display.
- Connect HDMI OUT 2, HDMI OUT 3, and HDMI OUT 4 to additional displays as needed.
- Connect OPTICAL OUT to an amplifier, soundbar, or audio receiver if digital audio output is needed.
- Connect L/R OUT to powered speakers or an analog audio device if stereo analog audio is needed.
- Connect the included DC 5V/1A power adapter.
- Set the EDID switch to AUTO or COPY.
- Set the 4K to 1080p dial switch based on the display setup.
- Power on the HDMI source, displays, splitter, and audio devices.
- Check that the POWER LED is on.
- Check the HDMI IN LED to confirm the source is detected.
- Check HDMI OUT 1–4 LEDs to confirm connected displays are detected.
- Test video on all displays and audio from HDMI, optical, and L/R outputs.
HDMI Cable Requirement — Critical
Use high-quality HDMI cables rated for the resolution being used.
| Signal Type | Cable Recommendation |
| 4K@60Hz 4:4:4 | 18Gbps HDMI cables |
| 1080p | High-speed HDMI cables |
| Mixed display setups | Use downscaling and compatible EDID settings |
Poor HDMI cables may cause:
- No video
- Flickering
- Black screen
- One output not working
- 4K@60Hz not working
- Downscaling issues
- HDR issues
- HDCP handshake issues
- Audio dropouts
For troubleshooting, test each HDMI cable directly between the source and display.
Audio Cable Requirement — Critical
Use the correct audio cable for the audio output being used.
| Audio Output | Cable Type |
| OPTICAL OUT | Optical Toslink cable |
| L/R OUT | 3.5mm stereo audio cable |
Poor or loose audio cables may cause no audio, intermittent sound, or audio dropouts.
If analog L/R audio does not work, set the source audio format to PCM 2.0.
Power Requirement — Critical
The UHDS-104A uses a DC 5V/1A power adapter.
| Power Detail | Value |
| Power adapter input | AC 100–240V, 50/60Hz |
| Power adapter output | DC 5V/1A |
| Maximum power consumption | 3.5W |
| POWER LED | Blue when powered |
If the POWER LED does not turn on, check the power adapter, outlet, and DC 5V connection.
Understanding AUTO EDID Mode
AUTO mode compares the EDID information from displays connected to HDMI OUT 1 through HDMI OUT 4.
Use AUTO mode when:
- Displays have different resolution support
- Displays have different audio capability
- Some displays do not show video in COPY mode
- A compatible shared EDID is needed
- The installation includes mixed display models
AUTO mode helps the source output a format that works across the connected displays.
Understanding COPY EDID Mode
COPY mode copies the EDID from HDMI OUT 1.
Use COPY mode when:
- HDMI OUT 1 is the main display
- The source should follow the main display’s capability
- The main display supports the desired resolution and audio format
- You want a fixed reference display for EDID
If OUT 1 is not connected, the unit checks OUT 2, then OUT 3, then OUT 4.
Understanding 4K to 1080p Downscaling
Downscaling allows a 4K input signal to be converted to 1080p output.
Use downscaling when:
- One or more displays are only 1080p
- A 1080p display does not show a 4K source
- Mixed 4K and 1080p displays are connected
- A stable 1080p output is needed
Downscaling does not upgrade a 1080p signal to 4K. It only reduces 4K output to 1080p.
Understanding Audio Extraction
Audio extraction allows the UHDS-104A to send HDMI audio to separate audio outputs.
Use OPTICAL OUT for:
- Amplifiers
- AV receivers
- Soundbars
- Digital audio processors
- Audio systems with optical input
Use L/R OUT for:
- Powered speakers
- Analog amplifiers
- Stereo speakers
- 3.5mm audio systems
The application diagram on page 10 shows OPTICAL OUT connected to an amplifier and L/R OUT connected to speakers.
Supported Video and Audio
The UHDS-104A supports video formats including:
| Supported Video |
| 720p@50/60Hz |
| 1080p@50/60Hz |
| 4K2K@24Hz |
| 4K2K@30Hz |
| 4K2K@50/60Hz 4:4:4 |
| RGB |
| YCbCr 4:4:4 |
| YCbCr 4:2:2 |
| 4K60Hz 8-bit |
| 1080p 12-bit |
Supported HDMI audio formats include:
| Supported HDMI Audio |
| LPCM |
| Dolby Digital |
| Dolby Digital Plus |
| Dolby Digital EX |
| Dolby TrueHD |
| DTS |
| DTS-EX |
| DTS-96/24 |
| DTS High Res |
| DTS-HD Master Audio |
| DSD |
Supported optical audio formats include:
| Supported Optical Audio |
| LPCM 2.0 / 2.1CH |
| Dolby 5.1 |
| Dolby TrueHD |
| Dolby Digital Plus |
| DTS 5.1 |
| DTS-ES 6 |
| DTS-HDMA 5.1 |
| DTS HD-HRA 5.1 |
Supported analog audio:
| Supported Analog Audio |
| PCM 2.0 |
Supported Technical Specifications
| Specification | Support |
| Product Type | 1x4 HDMI 2.0 splitter with scaler and audio extraction |
| HDMI Version | HDMI 2.0b |
| HDCP Version | HDCP 2.2 and HDCP 1.4 |
| Video Bandwidth | 18Gbps |
| Maximum Resolution | 4K@50/60Hz 4:4:4 |
| Other Resolutions | 720p50/60Hz, 1080p50/60Hz, 4K2K24Hz, 4K2K30Hz |
| Color Depth | 4K60Hz 8-bit, 1080p 12-bit |
| Color Space | RGB, YCbCr 4:4:4, YCbCr 4:2:2 |
| HDMI Audio | LPCM, Dolby Digital / Plus / EX, Dolby TrueHD, DTS, DTS-HD Master Audio, DSD |
| Optical Audio | LPCM 2.0 / 2.1CH, Dolby 5.1, Dolby TrueHD, Dolby DD+, DTS 5.1, DTS-ES 6, DTS-HDMA 5.1, DTS HD-HRA 5.1 |
| Analog Audio | PCM 2.0 |
| HDMI Input | 1 x HDMI IN |
| HDMI Outputs | 4 x HDMI OUT |
| Audio Outputs | 1 x OPTICAL OUT, 1 x L/R OUT 3.5mm |
| EDID Management | AUTO / COPY |
| Downscaling | 4K to 1080p |
| Firmware Port | Micro-USB SERVICE port |
| Power Supply | DC 5V/1A |
| Power Consumption | 3.5W max |
| Housing | Metal enclosure |
| Color | Black |
| Dimensions | 180mm x 62mm x 14mm |
| Weight | 227g |
| Operating Temperature | 32°F to 104°F / 0°C to 40°C |
| Storage Temperature | -4°F to 140°F / -20°C to 60°C |
| Relative Humidity | 20–90% RH, non-condensing |
| ESD Protection | ±8kV air-gap, ±4kV contact |
What Source Devices Is the UHDS-104A Compatible With?
The UHDS-104A is compatible with HDMI source devices such as:
- Blu-ray players
- DVD players
- PS5
- Game consoles
- Cable boxes
- Satellite receivers
- Streaming devices
- Media players
- Desktop PCs
- Laptops with HDMI output
- DVRs
- NVRs
- HDMI switch outputs
- HDMI matrix outputs
The source must output a supported HDMI resolution up to 4K@60Hz.
What Displays Is the UHDS-104A Compatible With?
The UHDS-104A can connect to HDMI displays such as:
- 4K TVs
- 1080p TVs
- Monitors
- Projectors
- Commercial displays
- Digital signage displays
- Restaurant TVs
- Bar displays
- Classroom displays
- Conference room displays
- Retail displays
- Worship facility displays
For 4K@60Hz, the display must support the selected 4K input format.
What Audio Devices Is the UHDS-104A Compatible With?
The UHDS-104A can connect to audio devices such as:
- Amplifiers
- AV receivers
- Soundbars with optical input
- Digital audio processors
- Powered speakers
- Analog speakers with 3.5mm input
- Stereo audio systems
Use OPTICAL OUT for digital audio systems.
Use L/R OUT for analog stereo audio systems.
Frequently Asked Questions
Q: What is the OREI UHDS-104A used for?[Text Wrapping Break]A: It is used to split one HDMI source to four HDMI displays and extract audio through optical and 3.5mm analog outputs.
Q: Is the UHDS-104A a splitter or extender?[Text Wrapping Break]A: It is an HDMI splitter. It does not extend HDMI over CAT cable by itself.
Q: How many HDMI inputs does it have?[Text Wrapping Break]A: It has one HDMI input.
Q: How many HDMI outputs does it have?[Text Wrapping Break]A: It has four HDMI outputs.
Q: Does it show the same content on all displays?[Text Wrapping Break]A: Yes. All connected displays show the same HDMI source.
Q: Can it show different content on each display?[Text Wrapping Break]A: No. It duplicates one HDMI input to all outputs.
Q: Can it extend my computer desktop across four screens?[Text Wrapping Break]A: No. It mirrors the same PC screen to multiple displays.
Q: Does the UHDS-104A support 4K@60Hz?[Text Wrapping Break]A: Yes. It supports up to 4K@50/60Hz 4:4:4.
Q: Does it support 8K?[Text Wrapping Break]A: No. It supports up to 4K@60Hz.
Q: Does it support 4K@120Hz?[Text Wrapping Break]A: No. It does not support 4K@120Hz.
Q: What HDMI version does it support?[Text Wrapping Break]A: It supports HDMI 2.0b.
Q: What HDCP version does it support?[Text Wrapping Break]A: It supports HDCP 2.2 and HDCP 1.4.
Q: What video bandwidth does it support?[Text Wrapping Break]A: It supports 18Gbps video bandwidth.
Q: Does it support downscaling?[Text Wrapping Break]A: Yes. It supports 4K to 1080p downscaling.
Q: How do I enable 4K to 1080p downscaling?[Text Wrapping Break]A: Set the 4K to 1080p dial switch to ON.
Q: What happens when the 4K to 1080p switch is OFF?[Text Wrapping Break]A: The input and output signal stay in pass-through status.
Q: What happens when the 4K to 1080p switch is ON?[Text Wrapping Break]A: The input signal is downscaled from 4K to 1080p and then output.
Q: Can I use mixed 4K and 1080p displays?[Text Wrapping Break]A: Yes. Use the 4K to 1080p downscaling switch if 1080p displays cannot accept the 4K signal.
Q: Does it support EDID management?[Text Wrapping Break]A: Yes. It supports AUTO and COPY EDID modes.
Q: What is AUTO EDID mode?[Text Wrapping Break]A: AUTO compares the EDID of displays connected to HDMI OUT 1–4 and sends optimal EDID information to the source.
Q: What is COPY EDID mode?[Text Wrapping Break]A: COPY copies the EDID from the display connected to HDMI OUT 1.
Q: Which output is used for EDID copy?[Text Wrapping Break]A: HDMI OUT 1 is used first. If OUT 1 has no detected EDID, the unit checks OUT 2, OUT 3, and OUT 4.
Q: Does it extract audio?[Text Wrapping Break]A: Yes. It extracts audio from HDMI IN to OPTICAL OUT and L/R OUT.
Q: Does it have optical audio output?[Text Wrapping Break]A: Yes. It has OPTICAL OUT.
Q: Does it have analog audio output?[Text Wrapping Break]A: Yes. It has L/R OUT through a 3.5mm stereo mini-jack.
Q: What audio format does L/R OUT support?[Text Wrapping Break]A: L/R OUT supports PCM 2.0.
Q: What should I do if L/R analog audio does not work?[Text Wrapping Break]A: Set the HDMI source audio output to PCM / Stereo.
Q: What optical audio formats are supported?[Text Wrapping Break]A: It supports LPCM 2.0 / 2.1CH, Dolby 5.1, Dolby TrueHD, Dolby Digital Plus, DTS 5.1, DTS-ES 6, DTS-HDMA 5.1, and DTS HD-HRA 5.1.
Q: What HDMI audio formats are supported?[Text Wrapping Break]A: It supports LPCM, Dolby Digital, Dolby Digital Plus, Dolby Digital EX, Dolby TrueHD, DTS, DTS-EX, DTS-96/24, DTS High Res, DTS-HD Master Audio, and DSD.
Q: Does it support Dolby Atmos?[Text Wrapping Break]A: Dolby Atmos is not listed in this manual for the UHDS-104A.
Q: Does it support DTS:X?[Text Wrapping Break]A: DTS:X is not listed in this manual for the UHDS-104A.
Q: Does it support ARC or eARC?[Text Wrapping Break]A: ARC and eARC are not listed for this model.
Q: Does it support IR control?[Text Wrapping Break]A: IR control is not listed for this model.
Q: Does it support RS-232?[Text Wrapping Break]A: RS-232 control is not listed for this model.
Q: Does it have a firmware update port?[Text Wrapping Break]A: Yes. It has a Micro-USB SERVICE port for firmware updates. The manual notes this is for manufacturer use only.
Q: What does the POWER LED mean?[Text Wrapping Break]A: The blue POWER LED turns on when the device is powered.
Q: What does the HDMI IN LED mean?[Text Wrapping Break]A: The blue HDMI IN LED turns on when signal is detected from the HDMI IN port.
Q: What do HDMI OUT 1–4 LEDs mean?[Text Wrapping Break]A: The corresponding blue LED turns on when that HDMI output is connected to a display and outputting signal.
Q: What power adapter does it use?[Text Wrapping Break]A: It uses a DC 5V/1A power adapter.
Q: What is the maximum power consumption?[Text Wrapping Break]A: Maximum power consumption is 3.5W.
Q: What should I do if there is no video on all displays?[Text Wrapping Break]A: Check the power adapter, HDMI source, HDMI IN cable, EDID setting, HDMI IN LED, and source output resolution.
Q: What should I do if one display has no video?[Text Wrapping Break]A: Check that output’s HDMI cable, display input, display power, and HDMI OUT LED. Also test the display on another HDMI output.
Q: What should I do if a 1080p display does not show a 4K source?[Text Wrapping Break]A: Turn the 4K to 1080p dial switch ON to enable downscaling.
Q: What should I do if 4K@60Hz does not work?[Text Wrapping Break]A: Use 18Gbps HDMI cables, confirm the source and displays support 4K@60Hz, check EDID mode, and test with downscaling OFF first.
Q: What should I do if optical audio does not work?[Text Wrapping Break]A: Check the optical cable, confirm the amplifier input is set correctly, and make sure the source audio format is supported by the amplifier.
Q: What should I do if analog audio does not work?[Text Wrapping Break]A: Set the source audio to PCM 2.0 / Stereo and check the 3.5mm audio cable and speaker input.
Q: Does the UHDS-104A need external power?[Text Wrapping Break]A: Yes. Connect the included DC 5V/1A power adapter to the splitter.
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