HD-108-A Overview and Use Cases – OREI

What Is the HD-108-A?

The OREI HD-108-A is a 1x8 HDMI Splitter that takes a single HDMI source and distributes it to eight HDMI displays simultaneously. All eight outputs carry an identical copy of the input signal. It supports video resolutions up to 4K@30Hz, as well as 1080p@60Hz, with HDR10, Dolby Vision pass-through, and 3D support. It is compliant with HDMI 1.4 and HDCP 1.4.

The HD-108-A is ideal for home theaters, classrooms, conference rooms, digital signage, and any other environment where the same content needs to appear on up to eight screens at the same time. It features EDID management via a front-panel 2-position DIP switch, a physical power switch, and a compact rack-friendly metal enclosure.

IMPORTANT — HD-108-A Sends the Same Source to All 8 Outputs

The HD-108-A is a splitter, not a switcher or matrix. It accepts one HDMI source and mirrors that signal to all eight outputs simultaneously.

All eight connected displays will always show the same content. You cannot assign different sources to different outputs.
All outputs are active at the same time. You cannot disable individual outputs.
Common use cases include displaying the same presentation across multiple conference room screens, running digital signage on several monitors, or distributing a cable box signal to TVs in multiple rooms.

IMPORTANT — HD-108-A Does Not Downscale 4K to 1080P

The HD-108-A does not perform any downscaling. If your source is outputting 4K, the splitter will pass that 4K signal to all outputs — it will not convert it to 1080P for displays that do not support 4K.

If any of your connected displays only supports 1080P, you must set the source device itself to output 1080P before connecting it to the splitter.
Alternatively, use the EDID DIP switch to set mode 00 (forces 1080P@60Hz), which tells the source to output 1080P rather than 4K.
The maximum supported resolution is 4K@30Hz. This splitter does not support 4K@60Hz. If your source outputs 4K@60Hz, set it to 4K@30Hz or 1080P for reliable results.

IMPORTANT — Maximum Resolution Is 4K@30Hz, Not 4K@60Hz

The HD-108-A is based on HDMI 1.4 with 10.2Gbps bandwidth. This is an important consideration when selecting it for your setup:

It supports 4K@30Hz 4:4:4, but does not support 4K@60Hz.
For 1080P@60Hz use cases, it is fully capable and recommended.
If you need 4K@60Hz distribution to multiple screens, consider the OREI UHD-PRO104 (1x4, 4K@60Hz) instead.
The splitter passes HDR10 and Dolby Vision metadata through the HDMI signal, but HDR output depends on both the source and the connected display supporting the format.

Ports and Panel Layout

Port / Switch / LED	Location	Function
Power Switch	Front panel	Rocker switch to turn the splitter on (I) or off (O).
Power LED	Front panel	Red LED that lights up when the splitter is powered on.
EDID DIP Switch	Front panel	2-position DIP switch for setting the EDID mode. Note: 0 = UP, 1 = DOWN. 00: Forces 1080P@60Hz, 2-channel audio on all outputs. 01: Forces 4K@30Hz, 2-channel audio on all outputs. 10: Copies the EDID from OUT 1 to all outputs (falls back to 1080P@60Hz if OUT 1 has no display). 11: Compares all connected displays and outputs the lowest common resolution supported by all.
OUT LEDs (1–8)	Rear panel	Green LEDs that light up when a display is connected to the corresponding HDMI output port.
HDMI OUT 1–8	Rear panel	Eight HDMI output ports. Connect display devices such as TVs, monitors, or projectors.
IN LED	Rear panel	Green LED that lights up when a source device is connected to the HDMI input port.
HDMI IN	Rear panel	Single HDMI input port. Connect your media source device such as a Blu-ray player, cable box, streaming stick, or laptop.
DC 12V	Rear panel	Connect the included 12V/1A power adapter.

Step-by-Step Setup

Connect your HDMI source device (such as a Blu-ray player, cable box, streaming stick, or laptop) to the HDMI IN port on the rear panel.
Connect up to eight displays (TVs, monitors, or projectors) to the HDMI OUT 1 through OUT 8 ports on the rear panel. You do not need to fill all eight ports — unused ports can remain empty.
Connect the included 12V/1A power adapter to the DC 12V port on the rear panel.
Set the EDID DIP switch on the front panel before powering on. For most 1080P setups, use 00 (forces 1080P@60Hz). For 4K@30Hz setups, use 01. To match the EDID of your OUT 1 display, use 10. To let the splitter find the lowest common resolution among all displays, use 11.
Flip the Power Switch on the front panel to the ON (I) position. The red Power LED will light up.
The green IN LED on the rear panel will light up when a source signal is detected. The green OUT LEDs will light up for each output port that has a display connected.
Confirm that all connected displays are showing the source content. If any display shows no picture, check the cable, try a different EDID setting, or reduce the source resolution.

Cable Requirement — Important

Use Premium High Speed HDMI cables for best performance. Recommended maximum cable lengths are 32 feet (10 meters) for 4K@30Hz signals and 50 feet (15 meters) for 1080P@60Hz signals. Cables over 30 feet are not recommended in general. Longer or lower-quality cables can cause signal dropouts, flickering, or no picture.

Understanding EDID Management

EDID (Extended Display Identification Data) tells the source device what resolutions and audio formats the connected displays support. Because the HD-108-A connects one source to eight displays that may have different capabilities, its EDID DIP switch lets you set a fixed profile. Note: on this switch, 0 = UP and 1 = DOWN.

00: Forces all outputs to 1080P@60Hz with 2-channel audio. Recommended when you have a mix of 4K and 1080P displays, or when you want consistent output across all screens.
01: Forces all outputs to 4K@30Hz with 2-channel audio. Use this when all connected displays support 4K@30Hz.
10: Copies the EDID from the display connected to HDMI OUT 1 and applies it to all outputs. If no display is detected on OUT 1, the splitter falls back to 1080P@60Hz. Best when all displays are identical.
11: The splitter reads the EDID from all connected displays and selects the lowest common resolution that every display supports. This ensures compatibility but may result in a lower resolution than your displays are individually capable of.

After changing the EDID switch, power cycle the source device so it re-reads the new EDID.

What Source Devices Is the HD-108-A Compatible With?

The HD-108-A is compatible with any HDMI 1.4 source device, including:

Cable and satellite set-top boxes
Streaming devices (e.g., Amazon Fire TV Stick, Roku, Apple TV)
Blu-ray and DVD players
Laptops and desktop computers with HDMI output
Gaming consoles (note: output will be limited to 4K@30Hz maximum)

The splitter is compliant with HDMI 1.4 and HDCP 1.4. Sources using HDCP 2.2 or higher (such as some 4K streaming content) may not pass through correctly, as the splitter only supports HDCP 1.4.

What Displays Is the HD-108-A Compatible With?

The HD-108-A is compatible with any HDMI display, including:

1080P TVs and monitors (the most common use case)
4K TVs and monitors (receiving a 4K@30Hz or downscaled 1080P signal)
Projectors with HDMI input
Computer monitors with HDMI input

You can mix different types of displays across the eight outputs. Use the EDID switch to set a resolution that all your displays can handle. Remember that the splitter does not downscale — if you set the source to 4K@30Hz and connect a 1080P display, that display may show no picture. Setting the EDID switch to 00 (1080P@60Hz) is the safest option for mixed display environments.

Frequently Asked Questions

Q: What is the OREI HD-108-A used for?

The HD-108-A is a 1x8 HDMI splitter that takes one HDMI source and distributes it to up to eight displays simultaneously. All outputs show the same content at the same time.

Q: Does the HD-108-A support 4K@60Hz?

No. The HD-108-A is based on HDMI 1.4 with 10.2Gbps bandwidth, which supports 4K@30Hz but not 4K@60Hz. For 4K@60Hz distribution, consider the OREI UHD-PRO104 (1x4) instead.

Q: My 1080P monitor is not showing a picture. What should I do?

The HD-108-A does not downscale 4K to 1080P. If your source is set to output 4K, the 1080P display will not receive a compatible signal. Either set the source device to output 1080P, or set the EDID DIP switch to 00 (forces 1080P@60Hz on all outputs) so the source automatically outputs 1080P.

Q: Can each output show a different source?

No. The HD-108-A is a splitter with one input. All eight outputs always mirror the single HDMI input. To send different sources to different displays, you would need an HDMI matrix switcher.

Q: What does the EDID DIP switch do and how should I set it?

The EDID switch tells the source device what resolution to output. Setting 00 forces 1080P@60Hz on all outputs — recommended for mixed display setups. Setting 01 forces 4K@30Hz. Setting 10 copies the EDID from OUT 1. Setting 11 uses the lowest resolution common to all displays. After changing it, power cycle the source device.

Q: Does the HD-108-A support HDR?

It supports pass-through of HDR10 and Dolby Vision metadata via HDMI. Whether HDR actually displays depends on the connected source and display both supporting the HDR format. The splitter itself does not process or convert HDR — it simply passes the signal through.

Q: Does the HD-108-A support 3D content?

Yes. It supports all HDMI 3D TV formats as pass-through, as long as the source and display both support the 3D format being used.

Q: I am not getting video output on one or more displays. What should I try?

First, try setting the source to a lower resolution (such as 1080P). Then try swapping HDMI cables for shorter, higher-quality ones. Finally, try a different EDID setting. Cables over 30 feet are not recommended and may cause signal issues.

Q: What is the maximum HDMI cable length?

For 4K@30Hz, use cables up to 32 feet (10 meters). For 1080P@60Hz, cables up to 50 feet (15 meters) are supported. Cables over 30 feet are generally not recommended for reliable performance.