SmartAVI HDN-4Quad - 4 Port Quad Monitor 4K HDMI KVM w/ 2x USB Peripheral Hub, RS-232 & Audio



Replaced by: SmartAVI SM-UHN-4Q-S
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Model: Quad Monitor

The SmartAVI HDN-4Quad is a dedicated multi-platform KVM switch capable of managing up to 4 different computers through four HDMI monitors, one USB keyboard & mouse, a single set of speakers and a USB 2.0 Device.

The USB emulation technology utilized by HDN-4Quad enables immediate hotkey source switching through a remote USB keyboard and mouse. HDN-4Quad uses single link connectors providing high resolutions of up to 4K (3840x2160 @ 30Hz) with zero pixel loss from TMDS signal correction.

SmartAVI HDN-4Quad Rear

  • 4-port KVM switching; access & control keyboard-video-mouse functions on up to 4 remote computers
  • Supports Ultra-HD 4K (3840x2160 @ 30Hz) - 4K-ready HDMI 2.0 connectors
  • Zero pixel loss with TMDS signal correction
  • Supports all USB 2.0 Devices (keyboard, mouse, peripherals).
  • 2x USB Peripheral Ports - Independent (asynchronous) switching of KVM and peripheral USB ports.
  • Balanced stereo audio output - independent switching. Users can listen to audio from one computer while working on the other or scan a document and save in another computer.
  • Front panel keys for selecting users and channels manually
  • RS-232 control for remote control
  • Hot-key commands for quick channel selection.
  • Complete keyboard emulation for error free booting
  • Control Sun, Mac, Linux, Unix or PC computers from a common KVM console
  • Rack mountable in a standard 19 inch rack (rackmount kit sold separately)

SmartAVI HDN-4Quad Application

Controlling the HDN-4Quad

The HDN-4Quad is plug-and-play, easy to install into any AV setup and use right out of the box! Once set up, the HDN-4Quad is controlled with:

  • Front Panel Buttons: Two simple source selection buttons that make it easy to switch command between different computers.
  • USB Keyboard Hotkey Commands: Simple hotkey commands over PC that offer more robust control of the HDN-4Quad.
  • TCP/IP Web Console: Connect to an online interface that offers full visual command of the HDN-4Quad's switching functions.

Display Data (EDID) Learning & Programming

Detection of DDC signals for all attached devices is effortless with HDN-4Quad due to its real EDID learning and programming. This is vital in optimizing the resolution of the selected graphics card to properly display on the remote monitor. Furthermore, the EDID learning feature continues to replicate the right DDC for the computer to enable the display card to effectively work when unused ports are not selected.

Full USB Keyboard & Mouse Emulation

The USB keyboard and mouse emulation utilized by HDN-4Quad provides accurate and quick source switching by means of keyboard hotkeys and mouse actions. HDN-4Quad imitates the presence of a keyboard and mouse for every attached computer through a USB cable. This is essential as it simulates the existence of the keyboard and mouse to all the computers while switching without interruptions.


  • (1) HDN-4Quad
  • (1) Power supply
  • (1) Quick Start Guide

SmartAVI HDN-4QuadS Specifications:

FormatHDMI 2.0
Maximum Pixel Clock 165 MHz
Input Interface(16) HDMI
Output Interface(4) HDMI
ResolutionUp to 4K UHD (3840x2160 @ 30Hz)
DDC5 volts p-p (TTL)
Input EqualizationAutomatic
Input Cable LengthUp to 20 ft.
Output Cable LengthUp to 20 ft.
Data Rate1.65 Gbps per color
Input Interface(4) 3.5 mm Stereo Audio
Output Interface(1) 3.5 mm Stereo Audio
Impedance600 Ohm
Frequency Response20 Hz to 20 kHz
Nominal Level0-1.0 V
Common ModeRejection at 60 dB
Signal TypeUSB 2.0, 1.1, and 1.0 w/ internal hub
Input Interface(4) USB Type B (female)
Output Interface(2) USB 1.1 Type A (female) for keyboardand mouse
(2) USB 2.0 Type A Transparent
Front Panel Buttons< M1||M2 > source selection buttons
TCP/IP Web Consolevia web-based control console
Hot Keysvia USB keyboard
PowerExternal 100-240 VAC/ 5VDC4A @ 20W
Dimensions12.5" W x 4.3" H x 6.4" D
Weight4.9 lbs.
ApprovalsUL, CE, ROHS Compliant
Operating Temp.32-131 °F (0-55 °C)
Storage Temp.-4-185 °F (-20-85 °C)
HumidityUp to 95%
EmulationKeyboard and Mouse; EDID information from display
UPC / EAN Barcode icon
UPC 813280020862
EAN 0813280020862
Question: Can the monitors be viewed independently? In other words, is it possible to have monitor 1 showing output from computer 1, and monitors 2-4 showing output from computer 2?
Answer: Thank you for your inquiry,

That would absolutely be possible. You can simply plug in the monitor cables from computer 2 to the inputs for the monitors 2-4 on port 1.

If you want want the monitors from computer 2 to show on multiple ports, you can use a HDMI splitter to split the video signal to multiple ports.

For a recommendation based on your application, please feel free to contact your KVM Switches Online sales representative directly.

Question: 1. I will be using 4 display monitors, between one windows desktop and one linux desktop. Will this work so that each time I am in one of the environments I will have the 4 screen real estate? (2.) Will it still work if I use hdmi to dvi-d adapters? And how many cables would in need to complete a quad screen setup?
Answer: Thank you for your inquiry,
  1. That is correct! You can use this SmartAVI HDN-4Quad to switch between two desktop computers (one Windows, and one Linux) and use all 4 monitors within each desktop in standard "extended mode" or "mirrored mode".
  2. Using HDMI to DVI-D adapters like this Adder VSCD11 should be fully compatible. The only two things I would note about using adapters is:
    1. In some cases lower quality adapters can interfere with pulling EDID data, and
    2. If you have any sources that require HDCP / CEC like bluray players or projectors, those schemes usually aren't supported by HDMI to DVI adapters.
  3. For 2 source computers in quad monitor setup you would need: (2x) CCHDKVM06 USB HDMI KVM Cables + (6x) HDMI cables i.e. C2G 56783.
Please let us know if there is anything else we can help you with!

Question: Do I need any additional accessories to rack mount the HDN-4Quad?
Answer: Thank you for your inquiry,

The SmartAVI HDN-4Quad KVM switch can be rack mounted using the optional SM-Rack rack mounting kit which is sold separately.

Please let us know if there is anything else we can help you with!

Question: The output on my minitower is 2xmini display port & 1 hdmi. Would this work with adapters? And what adapters are recommended?
Answer: Thank you for your inquiry,

The HDN-4Quad should indeed work with video adapters for your application.

While adapter compatibility would depend on the application a little bit, you should be able to use for example C2G 54300 Mini-DP to DP adapters with TrippLite P136-06N-H2V2LB DP to HDMI adapters to support the 2x Mini-DP output at up to 4K resolution. If you only need up to 1080p resolution support, you could also just use the NTI DPMM-HDF-CBL Mini-DP to HDMI adapters.

Please let us know if there is anything else we can help you with!