What Is the HDA-934?
The OREI HDA-934 is an 18Gbps HDMI ARC/eARC audio extractor switch designed to work as both a 4x1 HDMI switch and an ARC/eARC audio extractor.
It allows you to connect up to three or four HDMI source devices, such as a streaming device, Blu-ray player, game console, cable box, or PC, and switch between them to display on one TV, projector, or monitor.
The HDA-934 also allows audio to be sent to an ARC/eARC soundbar or AV receiver through the Input 1 (eARC) port. It can extract audio directly from HDMI source devices, and it can also receive ARC/eARC audio from the TV when connected to an ARC/eARC-compatible TV.
The HDA-934 supports video resolutions up to 4K@60Hz, with a video bandwidth of 18Gbps, along with HDR, HDR10, HDR10+, Dolby Vision, and high-quality audio formats such as Dolby Atmos and DTS:X.
IMPORTANT — HDA-934 Also Works as a Normal 4x1 HDMI Switch
The HDA-934 can work like a standard 4-input, 1-output HDMI switch.
When ARC/eARC is turned off, all four HDMI input ports can be used for regular HDMI source devices. You can connect up to four devices and switch between them using the front panel button or the included IR remote.
For example, you can connect:
- Input 1: PC
- Input 2: Blu-ray player
- Input 3: Streaming device
- Input 4: Cable box or game console
- Output: TV, projector, or monitor
In this mode, the selected source device is sent to the TV through the HDMI output.
IMPORTANT — Input 1 Is Also the ARC/eARC Soundbar Port
Input 1 has a special function.
When ARC/eARC is turned off, Input 1 works as a normal HDMI input for a source device.
When ARC/eARC is turned on, Input 1 becomes the ARC/eARC audio output port for connecting an ARC/eARC soundbar or AV receiver.
This means that if you are using an ARC/eARC soundbar or AVR, it should be connected to Input 1 (eARC).
Once ARC/eARC mode is enabled, audio can be sent to the soundbar from either:
- The TV’s ARC/eARC audio return channel
- The HDMI source devices connected to Inputs 2, 3, or 4
IMPORTANT — HDA-934 Can Extract Audio from the TV or Directly from the Source
The HDA-934 can route audio in two different ways.
If you have an ARC/eARC TV, the HDMI output on the HDA-934 connects to the TV’s ARC/eARC HDMI port. This allows audio from the TV, including internal apps like Netflix, YouTube, Disney+, or Prime Video, to return through the HDA-934 and play through the connected ARC/eARC soundbar or AVR.
However, since the HDA-934 is also an audio extractor, it can also extract audio directly from HDMI source devices connected to Inputs 2, 3, or 4 and send that audio to the soundbar connected to Input 1.
This is useful because the soundbar can still receive audio from the connected HDMI sources even if the TV does not support ARC/eARC.
Ports and Panel Layout
| Port / LED / Button | Location | Function |
| AUTO LED | Front panel | Turns on when auto switching mode is enabled |
| IN 1/2/3/4 LEDs | Front panel | Lights up when the corresponding HDMI input is active or connected |
| AUTO/INPUT Button | Front panel |
Long press to switch between auto/manual input mode; Press once to cycle inputs in manual mode |
| EDID Button and LEDs | Front panel | Selects EDID mode: AUTO, 2.0CH, 5.1CH, or 7.1CH |
| eARC Button and LED | Front panel | Turns ARC/eARC mode on or off; LED turns on when ARC/eARC is enabled |
| IR Window | Front panel | Receives commands from the included IR remote |
| Input 1 (eARC) | Rear panel |
Works as normal HDMI Input 1 when ARC/eARC is off; works as ARC/eARC audio output for a soundbar or AVR when ARC/eARC is on |
| Input 2 | Rear panel |
Connect an HDMI source device such as a Blu-ray player, PS5, Xbox, streaming device, or PC |
| Input 3 | Rear panel |
Connect an HDMI source device such as a Blu-ray player, PS5, Xbox, streaming device, or PC |
| Input 4 | Rear panel |
Connect an HDMI source device such as a Blu-ray player, PS5, Xbox, streaming device, or PC |
| Output (eARC) | Rear panel | HDMI output to TV, projector, or monitor; supports ARC/eARC connection to TV |
| Service | Rear panel | Micro USB firmware update port |
| DC 5V | Rear panel | Connect the included 5V power adapter |
Step-by-Step Setup
- Connect the Output (eARC) port on the HDA-934 to your TV, projector, or monitor.
- If your TV supports ARC/eARC and you want TV app audio, connect the HDA-934’s Output (eARC) port to the TV’s ARC/eARC HDMI port.
- Connect your HDMI source devices to the HDA-934:
- Use Inputs 2, 3, and 4 for devices like a Blu-ray player, PC, streaming device, cable box, or game console.
- Connect an ARC/eARC soundbar or AVR to Input 1 (eARC).
- Connect the included 5V power adapter to the HDA-934.
- Turn on the TV, source devices, and soundbar or AVR.
- Press the eARC ON/OFF button to enable ARC/eARC mode if you are using a soundbar or AVR on Input 1.
- Use the AUTO/INPUT button or IR remote to select the input source.
- Use the EDID button to select the audio EDID mode:
- AUTO
- 2.0CH
- 5.1CH
- 7.1CH
- Play content and confirm video appears on the TV and audio plays through the connected soundbar or AVR.
HDMI Cable Requirement — Important
Use good-quality HDMI 2.0b cables rated for 18Gbps bandwidth for stable 4K@60Hz performance.
For best results, use certified Ultra High-Speed HDMI 2.1 cables, for lossless Dolby Atmos and DTS:X pass through.
Understanding the ARC/eARC Button
The ARC/eARC button controls whether Input 1 works as a normal HDMI input or as the audio output connection for an ARC/eARC soundbar or AVR.
When ARC/eARC is off, Input 1 works like a normal HDMI source input.
When ARC/eARC is on, Input 1 is used for connecting an ARC/eARC soundbar or AVR.
In ARC/eARC mode, the HDA-934 can send audio to the soundbar from the TV’s ARC/eARC channel or from HDMI sources connected to Inputs 2, 3, and 4.
Understanding the EDID Button
The EDID button controls what audio capability the connected HDMI source devices detect.
| EDID Mode | Function |
| AUTO | Uses the connected TV/display EDID |
| 2.0CH | Forces 2-channel stereo audio |
| 5.1CH | Forces 5.1-channel audio (Dolby Digital, DTS 5.1) |
| 7.1CH |
Forces 7.1-channel audio (Dolby Digital Plus, Dolby TrueHD, Dolby Atmos, DTS-HD Master Audio, DTS:X |
Use AUTO if you want the source device to follow the connected display’s reported audio capability.
Use 2.0CH if your audio system only supports stereo.
Use 5.1CH if your soundbar or AVR supports 5.1 surround sound.
Use 7.1CH if your AVR or sound system supports higher-channel audio formats like Dolby Atmos or DTS:X.
Understanding Auto and Manual Input Switching
The HDA-934 supports both auto and manual input switching.
In auto switching mode, the unit automatically detects connected source devices and switches to the last connected active input.
In manual switching mode, you can select the input yourself using the front panel AUTO/INPUT button or the included IR remote.
To change modes, press and hold the AUTO/INPUT button for about 2 seconds. When auto switching mode is enabled, the AUTO LED will turn on.
What Soundbars or AVRs Is the HDA-934 Compatible With?
The HDA-934 is designed for ARC/eARC soundbars and AV receivers that connect through HDMI ARC/eARC.
The soundbar or AVR should be connected to Input 1 (eARC) when ARC/eARC mode is enabled.
The HDA-934 does not provide Optical, RCA, or 3.5mm audio output. It is for HDMI ARC/eARC audio systems only.
What Source Devices Is the HDA-934 Compatible With?
The OREI HDA-934 is compatible with HDMI source devices such as:
- Blu-ray players
- Streaming devices
- Cable boxes
- Satellite boxes
- Gaming consoles
- PCs
- Laptops with HDMI output
- Media players
It supports up to 4K@60Hz video and can pass HDR, HDR10, HDR10+, Dolby Vision, and HDMI audio formats such as Dolby Atmos and DTS:X when supported by the full setup.
Frequently Asked Questions
Q: What is the OREI HDA-934 used for?
A: The HDA-934 is used as a 4x1 HDMI switch and ARC/eARC audio extractor. It lets you connect up to three HDMI sources to one TV while sending audio to an ARC/eARC soundbar or AVR.
Q: Can the HDA-934 work as a normal HDMI switch?
A: Yes. When ARC/eARC is turned off, the HDA-934 works as a normal 4x1 HDMI switch.
Q: Can I connect Apple TV to Input 1 (eARC) and get audio from my TV to my Homepods?
A: Apple TV’s ARC function works differently to that of a Soundbar or a TV. While you can connect the Apple TV to the Input 1 port on the HDA-934, it will not send audio to the Homepod speakers from the connected TV.
Q: Can the HDA-934 extract audio from my TV’s internal apps?
A: Yes, if your TV supports ARC/eARC and the HDA-934 Output (eARC) port is connected to the TV’s ARC/eARC HDMI port. This allows TV app audio to return to the soundbar connected to Input 1.
Q: Can the HDA-934 extract audio directly from source devices?
A: Yes. It can extract audio directly from HDMI source devices connected to Inputs 2, 3, or 4 and send that audio to the eARC soundbar or AVR connected to Input 1, even if your TV does not support ARC/eARC.
Q: Does the TV need ARC/eARC for source audio extraction to work?
A: No. If you have external HDMI source devices connected to Inputs 2, 3, or 4, the soundbar can receive audio directly from those even if the TV does not support ARC/eARC.
Q: Does the HDA-934 have Optical or 3.5mm audio output?
A: No. The HDA-934 sends audio through HDMI ARC/eARC only. It does not have Optical, RCA, or 3.5mm audio outputs.
Q: Does the HDA-934 support Dolby Atmos and DTS:X?
A: Yes, the HDA-934 supports high-quality HDMI audio formats including Dolby Atmos and DTS:X, as long as the source device, soundbar/AVR and the TV support them.
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