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DPHD-912 Overview and Use Cases

Siddhant
Updated

What Is the DPHD-912?

The OREI DPHD-912 is an 8K DP|HDMI audio extractor designed to extract audio from a DisplayPort or HDMI source and output that audio through Optical or 3.5mm stereo while passing video to a DisplayPort or HDMI display.

The DPHD-912 features OREI’s DP|HD combo port technology, which allows the same input and output ports to support either DisplayPort or HDMI connections. This makes it useful for mixed setups where the source and display may not use the same connector type.

For example, the DPHD-912 can be used for:

  • DisplayPort source to DisplayPort display 
  • DisplayPort source to HDMI display 
  • HDMI source to HDMI display 
  • HDMI source to DisplayPort display 

The DPHD-912 can extract audio from the video source and send it to an audio device through Optical or 3.5mm output. It supports high-resolution video up to 8K@30Hz and 4K@120Hz when using DisplayPort input, and up to 4K@60Hz when using HDMI input.

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IMPORTANT — Resolution Depends on Whether the Source Is DisplayPort or HDMI

The maximum video resolution depends on the input signal type.

If the source is connected using DisplayPort, the DPHD-912 can support higher resolutions such as:

  • 8K@30Hz 
  • 4K@120Hz 

This applies regardless of whether the output is connected using DisplayPort or HDMI. As long as the display and cable support the selected resolution, it will pass through.

If the source is connected using HDMI, the maximum supported resolution is limited to:

  • 4K@60Hz 

This limitation applies even if the output side is connected using DisplayPort.

In simple terms:

Source Input Output Type Maximum Resolution
DisplayPort input DisplayPort output Up to 8K@30Hz / 4K@120Hz
DisplayPort input HDMI output Up to 8K@30Hz / 4K@120Hz
HDMI input HDMI output Up to 4K@60Hz
HDMI input DisplayPort output Up to 4K@60Hz

 

So, if you want 8K@30Hz or 4K@120Hz, the source must be connected through DisplayPort.

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IMPORTANT — DP|HD Combo Port Supports Both DisplayPort and HDMI

The DPHD-912 uses OREI’s DP|HD combo connector, which supports both DisplayPort and HDMI cables in the same port.

This means you do not need a separate HDMI-to-DP or DP-to-HDMI converter. The unit can automatically detect whether a DisplayPort or HDMI cable is connected.

The combo port supports four common connection types:

  • DP to DP 
  • DP to HDMI 
  • HDMI to HDMI 
  • HDMI to DP 

When using an HDMI cable, insert it into the HDMI side of the combo port. The HDMI connector uses only part of the combo port, while the DisplayPort connector uses the full width. Make sure the cable is inserted correctly to avoid damaging the port.

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IMPORTANT — DPHD-912 Does NOT Decode or Downmix Audio

The DPHD-912 does not decode or downmix audio.

The Optical output supports LPCM 2.0, Dolby Digital 2/5.1CH, and DTS 2/5.1CH.

The 3.5mm L/R output supports LPCM 2.0 stereo only.

If you are using the 3.5mm output, your source device must be set to PCM, LPCM, or Stereo. If the source is set to Dolby Digital, DTS, Bitstream, Dolby TrueHD, DTS-HD Master Audio, Dolby Atmos, or DTS:X, the 3.5mm output will not produce audio because the DPHD-912 cannot convert surround sound into stereo.

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Ports and Panel Layout

Port / LED / Switch Location Function
Power LED Front panel Green LED lights up when the device is powered on
IN LED Front panel

Lights up when the DP/HDMI input port is connected to 

an active source
OUT LED Front panel

Lights up when the DP/HDMI output port is connected to 

an active display
Service Front panel USB-C port used for firmware updates
TV / Bitstream / 2CH Switch Front panel Selects audio EDID mode
DP/HDMI IN Front panel

Combo input port for connecting a DisplayPort or 

HDMI source
DP/HDMI OUT Rear panel

Combo output port for connecting a DisplayPort or 

HDMI display
Optical Out Rear panel

Connect to an Optical audio device such as a 

soundbar, AVR, or amplifier
L/R Out Rear panel

3.5mm stereo audio output for headphones, speakers, or 

other stereo audio devices
DC 5V Rear panel Connect the included power adapter

 

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Step-by-Step Setup

  1. Connect your source device to the DP/HDMI IN port using either a DisplayPort or HDMI cable. 
  2. Connect your display to the DP/HDMI OUT port using either a DisplayPort or HDMI cable. 
  3. Connect your audio device: 
    • Use Optical Out for a soundbar, AVR, amplifier, or speaker system. 
    • Use 3.5mm L/R Out for headphones, powered speakers, or stereo audio input. 
  4. Connect the included 5V power adapter to the DPHD-912. 
  5. Turn on the source device, display, and audio device. 
  6. Check that the Power LED, IN LED, and OUT LED are lit. 
  7. Set the TV / Bitstream / 2CH switch based on your audio setup. 
  8. If using 3.5mm audio, set the source audio format to PCM, LPCM, or Stereo. 
  9. If using high resolutions, confirm the source, display, and cables support the target resolution. 

 

HDMI / DisplayPort Cable Requirement — Important

For best results, use high-quality cables that match your setup.

Use a DisplayPort 1.4 or higher cable for DisplayPort input/output, especially for 8K@30Hz or 4K@120Hz.

Use HDMI 2.1 cables for 8K@30Hz or 4K@120Hz output. HDMI source input is limited to 4K@60Hz on this device.

In any case, do not use cables longer than 30 feet for 4K@60Hz transmission and 15 feet for 8K@30Hz or 4K@120Hz transmission.

 

Understanding the TV / Bitstream / 2CH Switch

The DPHD-912 includes a TV / Bitstream / 2CH switch that controls the audio EDID sent to the source device.

TV mode copies the connected TV/display EDID. The source will output audio based on what the display reports it supports.

Bitstream mode copies the TV video EDID but forces 5.1CH audio EDID. Use this when connecting a surround-capable soundbar or AVR through the Optical output and you want Dolby Digital or DTS 5.1 audio.

2CH mode copies the TV video EDID but forces 2.0CH audio EDID. Use this for stereo setups, especially when using the 3.5mm L/R output.

 

What Audio Devices Is the DPHD-912 Compatible With?

The OREI DPHD-912 is compatible with audio devices that accept Optical/Toslink or 3.5mm stereo audio input.

It can be used with:

  • Optical soundbars 
  • AV receivers with Optical input 
  • Amplifiers 
  • Powered speakers 
  • Headphones 
  • 3.5mm speaker systems 
  • Stereo amplifiers 

For Optical audio, the connected device must support the audio format being sent, such as LPCM 2.0, Dolby Digital, or DTS.

For 3.5mm audio, the source device must be set to PCM, LPCM, or Stereo.

 

What Source Devices Is the DPHD-912 Compatible With?

The DPHD-912 is compatible with HDMI and DisplayPort source devices such as:

  • Desktop PCs 
  • Gaming PCs 
  • Laptops with DisplayPort output 
  • Laptops with HDMI output 
  • Media players 
  • Streaming devices 
  • Blu-ray players 
  • Set-top boxes 
  • Game consoles with HDMI output 

For the highest resolutions, such as 8K@30Hz or 4K@120Hz, use a DisplayPort source. HDMI source input is limited to 4K@60Hz.

 

Frequently Asked Questions

Q: What is the OREI DPHD-912 used for? 
A: The DPHD-912 is used to extract audio from a DisplayPort or HDMI source and output that audio through Optical or 3.5mm while passing video to a DisplayPort or HDMI display.

Q: What is the DP|HD combo port? 
A: The DP|HD combo port is a hybrid connector that supports both DisplayPort and HDMI cables in the same port. It allows DP-to-DP, DP-to-HDMI, HDMI-to-HDMI, and HDMI-to-DP connections without a separate converter.

Q: Does the DPHD-912 support 8K@30Hz and 4K@120Hz? 
A: Yes, but only when the source input is DisplayPort. With DisplayPort input, the unit can support up to 8K@30Hz and 4K@120Hz, depending on the source, display and cable support.

Q: What is the maximum resolution when using HDMI input? 
A: When HDMI is used as the source input, the maximum supported resolution is 4K@60Hz. This applies whether the output is HDMI or DisplayPort.

Q: Can I use HDMI input and DisplayPort output for 8K or 4K@120Hz? 
A: No. If the source input is HDMI, the device is limited to 4K@60Hz output, even if the display is connected through DisplayPort.

Q: Can I use DisplayPort input and HDMI output for 8K@30Hz or 4K@120Hz? 
A: Yes, DisplayPort input can support up to 8K@30Hz or 4K@120Hz output, including when the display is connected through HDMI, as long as the display and cable support that resolution. Use HDMI 2.1 cable under 15 feet for high resolution support.

Q: Does the DPHD-912 decode or downmix audio? 
A: No. The DPHD-912 does not decode or downmix audio. The source must output an audio format supported by the connected audio output.

Q: Why am I not getting audio from the 3.5mm output? 
A: The 3.5mm output supports LPCM 2.0 stereo only. Set your source audio output to PCM, LPCM, or Stereo.

Q: Can I get Dolby Digital or DTS 5.1 from the Optical output? 
A: Yes, Optical can support Dolby Digital or DTS 5.1 if the source is sending a compatible format and the connected audio device supports it.

Q: Why is CEC not working? 
A: CEC works only over HDMI. If either the input or output connection is DisplayPort, CEC will not function. CEC passthrough works only when both the source and display are HDMI-based and CEC is enabled on both devices.

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