1. Introduction
The OREI BK-402A is a professional 8K 4x2 HDMI Matrix Switch designed for advanced audio and video distribution. This device features four HDMI inputs and two HDMI outputs, enabling you to independently route multiple source devices to two displays simultaneously. It supports resolutions up to 8K@60Hz with HDMI 2.1 and HDCP 2.3 compliance, ensuring compatibility with next-generation sources and displays.
Key features include 40Gbps high-bandwidth performance, support for VRR (Variable Refresh Rate), ALLM (Auto Low Latency Mode), and FVA (Fast VActive) for optimal gaming and high-frame-rate content. The matrix also offers eARC support between Input 1 and Output 1, alongside audio de-embedding through Optical (S/PDIF) and Analog 3.5mm outputs, supporting various audio formats like LPCM, Dolby Digital/Plus/TrueHD/Atmos, DTS, DTS-HD Master Audio, and DSD.
Figure 1: OREI BK-402A 8K 4x2 HDMI Matrix Switch.
2. Package Contents
Please verify that all items listed below are included in your package:
- 1x OREI BK-402A HDMI Matrix Switch
- 1x IR Remote Control
- 1x 5V/2A Multinational Power Supply
- 1x User Manual
Figure 2: Key features of the BK-402A.
3. Specifications
| Feature | Description |
|---|---|
| Product Dimensions | 8 x 3.5 x 1 inches |
| Item Weight | 1.1 pounds |
| Model Number | BK-402A |
| Color | Black |
| Connector Type | HDMI |
| Compatible Devices | Projector, Television |
| Cable Type | HDMI |
| HDMI Standard | HDMI 2.1, HDCP 2.3 |
| Video Bandwidth | 40Gbps |
| Max Resolution | 8K@60Hz (4:2:0 10-bit), 8K@30Hz (4:4:4 10-bit), 4K@120Hz (4:4:4 10-bit) |
| HDR Support | HDR10, Dolby Vision |
| Gaming Features | VRR, ALLM, FVA |
| Audio Extraction | Optical (S/PDIF), Analog 3.5mm |
| eARC Support | Input 1 to Output 1 |
Figure 3: Technical specifications and compact size.
4. Front Panel Features
The front panel of the BK-402A provides indicators and buttons for easy operation:
- Power Indicator: Illuminates when the device is powered on.
- Output 1/Output 2 Indicators: LEDs (1-4) show which input is currently routed to Output 1 and Output 2 respectively.
- eARC Indicator: Illuminates when eARC function is active.
- Output 1/Output 2 Buttons: Press to cycle through available inputs for the corresponding output.
- CONFIG DIP Switches: Used to set the working mode (Matrix, Splitter, Scaler, Pass-through). Refer to the manual for specific settings.
- EDID DIP Switches: Used to set EDID modes for resolution and audio formats. Refer to the manual for specific settings.
- Service Port (Micro USB): For firmware updates.
Figure 4: IR Remote Control for easy input switching.
5. Rear Panel Connections
The rear panel houses all the necessary input and output ports:
- OUT 1 (eARC) & OUT 2 HDMI Outputs: Connect to your displays (TVs, monitors, projectors). OUT 1 supports eARC functionality.
- INPUTS 1-4 HDMI Inputs: Connect your source devices (gaming consoles, streaming boxes, Blu-ray players, PCs). Input 1 also supports eARC.
- AUDIO OUT (Optical): Digital audio output for connecting to soundbars or receivers.
- AUDIO OUT (L/R 3.5mm): Analog audio output for connecting to powered speakers or headphones.
- DC 5V: Power input port.
Figure 5: Rear panel showing all input and output ports.
6. Setup Instructions
Follow these steps to set up your OREI BK-402A HDMI Matrix Switch:
- Connect Displays: Use high-quality HDMI 2.1 cables to connect your two displays to the OUT 1 (eARC) and OUT 2 ports on the matrix.
- Connect Source Devices: Use high-quality HDMI 2.1 cables to connect your four source devices (e.g., PS5, Xbox Series X, Apple TV, Roku) to the INPUTS 1-4 ports on the matrix.
- Connect Audio System (Optional): If you wish to use audio extraction, connect your soundbar or receiver to the OPTICAL or L/R 3.5mm audio output ports. For eARC functionality, ensure your TV and soundbar both support eARC and connect the TV to OUT 1 and the soundbar to the eARC port on your TV.
- Connect Power: Plug the provided 5V/2A power adapter into the DC 5V port on the matrix, then plug the adapter into a power outlet.
- Power On: Power on all connected devices (source devices, displays, and audio system). The matrix's power indicator should illuminate.
Video 1: Detailed guide on how to set up and use the OREI BK-402A eARC 4x2 HDMI Matrix Switch.
7. Operating Instructions
The OREI BK-402A offers flexible control options:
- Switching Inputs:
- Front Panel Buttons: Use the OUT 1 and OUT 2 buttons on the front panel to cycle through the connected HDMI inputs (1-4) for each respective output. The corresponding LED will indicate the active input.
- IR Remote Control: Use the included IR remote control to directly select inputs for OUT A (Output 1) and OUT B (Output 2). For example, press '1' under 'OUT A' to display Input 1 on Output 1.
- eARC Functionality:
- Ensure your TV is connected to OUT 1 (eARC) and your eARC-compatible soundbar is connected to your TV's eARC port.
- Press the eARC button on the front panel or remote to activate/deactivate the eARC function. The eARC indicator LED will show its status.
- Note: Both your TV and soundbar must support eARC for this function to work correctly.
- Audio Extraction:
- Audio from the selected HDMI input for Output 1 will be de-embedded and available through the OPTICAL and L/R 3.5mm audio output ports.
- The Optical output is limited to 5.1Ch, and the Analog 3.5mm output is limited to 2Ch. Ensure your source device outputs audio in compatible formats for sound output from these ports. The device does not downmix 7.1Ch to 5.1Ch or 2Ch.
Video 2: Overview of the OREI 8K eARC HDMI Matrix Switcher.
8. EDID and Configuration Management
The BK-402A features DIP switches for advanced configuration and EDID management, allowing you to optimize compatibility and performance with various devices:
| Switch Type | Function |
|---|---|
| CONFIG DIP Switch | Used to set the working mode of the matrix:
|
| EDID DIP Switch | Used to set EDID (Extended Display Identification Data) for optimal compatibility:
|
Note: Carefully consult the user manual for detailed instructions on setting these DIP switches to avoid compatibility issues.
9. Troubleshooting
If you encounter issues with your OREI BK-402A, please refer to the following common troubleshooting steps:
- No Signal/Intermittent Signal:
- Ensure all HDMI cables are securely connected and are HDMI 2.1 certified.
- Try different HDMI cables, as cable quality can significantly impact 8K/4K@120Hz signals.
- Verify that the correct input is selected for the corresponding output on the matrix.
- Check the EDID settings using the DIP switches. Try setting it to a lower resolution or a specific audio format if issues persist.
- Power cycle all connected devices (source, matrix, display).
- No Audio/Incorrect Audio Format:
- Ensure your audio system is correctly connected to the Optical or 3.5mm output.
- Verify that your audio system supports the audio format being output by the source device.
- If using eARC, confirm both your TV and soundbar support eARC and it's enabled on both devices.
- Check the EDID settings related to audio formats.
- Remote Control Not Responding:
- Ensure there are no obstructions between the remote and the IR receiver window on the front panel.
- Check and replace the remote control batteries if necessary.
10. Maintenance
To ensure the longevity and optimal performance of your OREI BK-402A, follow these maintenance guidelines:
- Keep the device in a cool, dry place away from direct sunlight, heat sources, and moisture.
- Clean the device with a soft, dry cloth. Do not use liquid or aerosol cleaners.
- Ensure proper ventilation around the unit to prevent overheating.
- Avoid dropping or subjecting the device to strong impacts.
11. Warranty and Support
The OREI BK-402A comes with a 12-month Manufacturer's Warranty. OREI also provides Lifetime Technical Support for its products.
For technical assistance, troubleshooting, or warranty claims, please contact OREI customer support through their official website or the contact information provided in your package.
