HD-401MV Overview and Use Cases

What Is the HD-401MV?

The OREI HD-401MV is an HDMI 4x1 Quad Multi-Viewer designed to display up to four HDMI source devices on one screen.

It allows four HDMI inputs to be shown on a single HDMI display and one VGA display at the same time. It supports multiple viewing layouts, including full-screen single-input viewing, quad-view display, dual-view display, and other multi-window modes.

The HD-401MV supports HDMI 1.4 and HDCP 1.4, with input resolutions automatically recognized from 480p to 1080p60 and PC resolutions from 800x600 to 1920x1080. The output resolution can be selected using the front-panel buttons or the included remote control, with maximum output up to 1920x1080@60Hz.

The unit also includes analog audio output through a 3.5mm stereo port, allowing audio from selected HDMI sources to be sent to speakers or an audio system.

The HD-401MV is useful for security monitoring, control rooms, conference rooms, classrooms, retail displays, production monitoring, AV testing, and setups where multiple HDMI sources need to be viewed on one display.

IMPORTANT — HD-401MV Is a 4x1 HDMI Quad Multi-Viewer

The HD-401MV combines up to four HDMI inputs onto one output display.

This product is a multi-viewer, not a full HDMI matrix.

It is designed to show multiple sources on one screen, or select one source full screen.

IMPORTANT — HDMI and VGA Outputs Show the Same Signal

The HD-401MV includes both HDMI and VGA output ports.

The VGA output mirrors the same signal as the HDMI output.

The HDMI and VGA outputs do not show independent layouts or different sources.

IMPORTANT — Supports up to 1080p@60Hz Output

The HD-401MV supports output resolution up to 1920x1080@60Hz.

The manual lists maximum output as 1080p@60Hz. This model does not output 4K.

IMPORTANT — HDMI Input Resolution Is Automatically Recognized

The HD-401MV automatically recognizes HDMI input resolution.

For best compatibility, set connected HDMI sources to 1080p60 or lower.

If a 4K source is connected, set the source output resolution to 1080p before using it with this multi-viewer.

IMPORTANT — Five Display Modes Are Supported

The HD-401MV supports five display modes.

Use the MODE button on the front panel or the Mode button on the remote control to cycle through display modes.

IMPORTANT — Mode 1 Is Full-Screen Source Selection

In Mode 1, the HD-401MV displays one HDMI input at a time.

The corresponding front-panel light turns on to show the selected input.

Use Mode 1 when you want one HDMI source displayed full screen.

IMPORTANT — Modes 2, 3, and 5 Show Four Inputs on One Screen

Modes 2, 3, and 5 display four HDMI inputs together on one screen.

In these modes, all four front-panel channel lights turn on.

Each window can select a different input source. Use CH1, CH2, CH3, or CH4 on the front panel, or Source 1–4 on the remote, to cycle the input source assigned to each window.

IMPORTANT — Mode 4 Shows Two Inputs on One Screen

Mode 4 displays two HDMI inputs at the same time.

In Mode 4, the CH1 and CH2 lights turn on.

Use the CH1 and CH2 buttons on the front panel or Source 1 and Source 2 on the remote to cycle through available HDMI input sources for each window.

IMPORTANT — Window Frame Can Be Turned On or Off

The display window frame can be opened or closed.

This is useful when the user wants cleaner multi-view layouts without visible window borders.

IMPORTANT — Equal Proportion Full-Screen Display Is Supported

The MODE button has a long-press function.

Use this when image proportion or scaling needs to be adjusted.

IMPORTANT — Analog Audio Output Is Supported

The HD-401MV includes a 3.5mm analog audio output.

Audio behavior depends on the display mode.

In multi-view modes, press CH1 / CH2 / CH3 / CH4 for up to 5 seconds to select audio output, or use the remote control to cycle audio output.

IMPORTANT — Control by Front Panel and Remote Control

The HD-401MV can be controlled in two ways.

Use the front-panel buttons or included remote control to select channels, display modes, output resolution, audio output, mute, and standby.

Ports and Panel Layout

Front Panel

Rear Panel

Step-by-Step Setup

1. Place the HD-401MV near the HDMI sources and display.
2. Connect HDMI source 1 to HDMI INPUT 1.
3. Connect HDMI source 2 to HDMI INPUT 2 if needed.
4. Connect HDMI source 3 to HDMI INPUT 3 if needed.
5. Connect HDMI source 4 to HDMI INPUT 4 if needed.

Examples include DVD players, Blu-ray players, media players, game consoles, cameras, DVRs, NVRs, computers, and HDMI matrix outputs.

1. Connect the HDMI OUTPUT to a TV, monitor, projector, or display.
2. If using a VGA display, connect VGA OUTPUT to the VGA display.
3. If using analog audio, connect AUDIO OUTPUT to speakers, amplifier, or other 3.5mm audio device.
4. Connect the included DC 12V/1A power adapter to the DC 12V input.
5. Power on the HDMI sources and display.
6. Use the RESO button to select the desired output resolution.
7. Use the MODE button to choose the display layout.
8. Use CH1 / CH2 / CH3 / CH4 buttons to select sources or window assignments.
9. Use the remote control if easier control is needed from the display area.
10. Test video, VGA output, audio output, source selection, display modes, and remote control.

HDMI Cable Requirement — Critical

Use good-quality HDMI cables.

Poor HDMI cables may cause:

• No picture
• Flickering
• Black screen
• Source not detected
• HDCP handshake issues
• Audio dropouts
• Multi-view windows not displaying correctly

For troubleshooting, test each HDMI source directly with the display before connecting through the HD-401MV.

VGA Cable Requirement — Critical

The VGA output mirrors the HDMI output.

If VGA output does not work:

• Confirm the VGA display supports the selected output resolution.
• Try 1280x720@60Hz or 1920x1080@60Hz.
• Check the VGA cable connection.
• Test the VGA display with another source.
• Confirm the HDMI output is working first.

The VGA output does not carry audio.

Use AUDIO OUTPUT separately for analog audio.

Audio Requirement — Critical

The HD-401MV supports LPCM 2.0 audio.

If there is no audio:

• Set the HDMI source audio output to PCM or Stereo.
• Confirm the correct audio source is selected in multi-view modes.
• Check the 3.5mm audio cable.
• Confirm the connected amplifier or speakers are powered and on the correct input.
• Use the remote Audio button to cycle audio output.
• Check whether mute is enabled on the remote.

Power Requirement — Critical

The HD-401MV requires the included DC 12V/1A power adapter.

If the unit does not power on:

• Check the DC 12V power adapter.
• Confirm the outlet is working.
• Check whether the POWER LED is green or red.
• Try power cycling the unit.

Surge protection is recommended.

Remote Control Functions

The included remote control can control power, resolution, display mode, source selection, audio, mute, and frame display.

The IR receiver window on the front panel receives commands from the included remote only.

Display Mode Details

Use Mode 1 for single-source viewing.

Use Modes 2, 3, and 5 for four-source monitoring.

Use Mode 4 for two-source side-by-side viewing.

Understanding the Application Example

The application diagram shows HDMI sources such as DVD or Blu-ray players connected to the HDMI inputs. The HDMI output connects to an HDTV, the VGA output connects to a TV or monitor, the 3.5mm audio output connects to 2.0 speakers, and the DC 12V adapter powers the unit.

This shows the main use case: several HDMI sources are combined into one multi-view output for display, while analog audio can be sent separately to external speakers.

Supported Technical Specifications

Package Contents

What HDMI Source Devices Is the HD-401MV Compatible With?

The HD-401MV can connect to HDMI source devices such as:

• DVD players
• Blu-ray players
• Media players
• Streaming devices
• Cable boxes
• Satellite receivers
• Game consoles
• DVRs
• NVRs
• Cameras with HDMI output
• Computers with HDMI output
• HDMI matrix outputs
• HDMI switch outputs

For best compatibility, set the source output to 1080p60 or lower.

What Displays Is the HD-401MV Compatible With?

The HD-401MV can connect to display devices such as:

• HDMI TVs
• HDMI monitors
• HDMI projectors
• VGA monitors
• VGA displays
• Commercial displays
• Control room displays
• Security monitoring displays
• Classroom displays
• Conference room displays

The display must support the selected output resolution.

Frequently Asked Questions

Q: What is the HD-401MV used for? 
A: It is used to display up to four HDMI sources on one HDMI or VGA display using multi-view layouts.

Q: Is the HD-401MV a quad multi-viewer? 
A: Yes. It is an HDMI 4x1 Quad Multi-Viewer.

Q: How many HDMI inputs does it have? 
A: It has four HDMI inputs.

Q: How many HDMI outputs does it have? 
A: It has one HDMI output.

Q: Does it also have VGA output? 
A: Yes. It has one VGA output.

Q: Does the VGA output show something different from HDMI output? 
A: No. The VGA output shows the same signal as the HDMI output.

Q: Does it support 4K? 
A: No. The maximum output resolution is 1920x1080@60Hz.

Q: What is the maximum output resolution? 
A: 1920x1080@60Hz.

Q: What HDMI version does it support? 
A: It supports HDMI 1.4.

Q: What HDCP version does it support? 
A: It supports HDCP 1.4.

Q: What audio format does it support? 
A: It supports LPCM 2.0 audio at 44.1kHz and 48kHz.

Q: Does it support Dolby or DTS audio? 
A: Dolby and DTS audio formats are not listed. Use PCM or Stereo audio for best compatibility.

Q: Does it have analog audio output? 
A: Yes. It has a 3.5mm stereo mini-jack audio output.

Q: Can I choose which source audio is output? 
A: Yes. In multi-view modes, audio output can be selected using CH1 / CH2 / CH3 / CH4 long press or the remote control.

Q: What is the default audio source in multi-view mode? 
A: The default audio output is from the CH1 screen.

Q: How does audio work in Mode 1? 
A: In Mode 1, audio follows the selected full-screen video source.

Q: How many display modes does it support? 
A: It supports five display modes.

Q: Can it show all four HDMI inputs at the same time? 
A: Yes. Modes 2, 3, and 5 can show four HDMI inputs on one screen.

Q: Can it show two HDMI inputs at the same time? 
A: Yes. Mode 4 shows two HDMI inputs with the same size.

Q: Can it show only one HDMI input full screen? 
A: Yes. Mode 1 displays one selected HDMI input full screen.

Q: Can I select different sources for each window? 
A: Yes. In Modes 2, 3, 4, and 5, the window source can be selected using the channel buttons or remote control.

Q: How do I change the display mode? 
A: Press the MODE button on the front panel or use the Mode button on the remote.

Q: How do I change output resolution? 
A: Press the RESO button on the front panel or the RES button on the remote.

Q: How do I turn the window frame on or off? 
A: Long press RESO for 5 seconds, or use the window-frame button on the remote.

Q: How do I select a full-screen source? 
A: Use Mode 1, then press CH1, CH2, CH3, or CH4 on the front panel, or Source 1, 2, 3, or 4 on the remote.

Q: Does it support remote control? 
A: Yes. A remote control is included.

Q: Does it support RS-232 control? 
A: RS-232 control is not listed.

Q: Does it support WebGUI or network control? 
A: WebGUI or network control is not listed.

Q: What is the SERVICE port used for? 
A: It is a Micro USB firmware update port for manufacturer use only.

Q: What power adapter does it use? 
A: It uses a DC 12V/1A power adapter.

Q: What is the power consumption? 
A: The manual lists power consumption as 5.28W max.

Q: What should I do if there is no picture? 
A: Check the HDMI source, HDMI cable, selected input, display input, output resolution, and power adapter. Test each source directly with the display.

Q: What should I do if VGA output does not display? 
A: Confirm the VGA display supports the selected resolution and try changing the output resolution with the RESO button.

Q: What should I do if there is no audio? 
A: Set the HDMI source audio to PCM or Stereo, check the 3.5mm audio cable, select the correct audio source, and make sure mute is not enabled.

Q: What should I do if the remote does not work? 
A: Make sure the remote is pointed at the front IR window and that nothing is blocking the receiver. Replace the remote battery if needed.

Q: Does the HD-401MV need external power? 
A: Yes. Connect the included DC 12V/1A power adapter.