Discontinued.4-Port, Dual-Head HDMI KVM Switch with USB 2.0, Stereo Audio, and 4K Ultra-HD Support

replaced by SM-UHN-4D

What is the HDN-4 DUO?

The HDN-4 DUO is a 4-port HDMI KVM switch with USB 2.0, stereo audio, and support for 4K Ultra-HD resolution video. Users can use the HDN-4 DUO to control up to 4 computers from a single keyboard-mouse combo with two 4K-ready HDMI displays.

The HDN-4 DUO offers easy source switching via push buttons, hot-keys, and RS-232 commands. It also features full USB keyboard-mouse emulation and EDID pass-through technology smooth, efficient, and uninterrupted switching.

How do you control HDN-4 DUO?

Controlling the HDN-4 DUO is both flexible and easy via three simple modes of operation:

  1. Push Buttons: The HDN-4 DUO comes equipped with clearly marked push buttons on its front-panel, putting KVM control literally within your reach!
  2. Hot-Keys: You can also use hot-key commands directly from your keyboard to control various functions for the HDN-4 DUO, like switching, activation, and more!
  3. RS-232: Use an external device with RS-232 capabilities to control the HDN-4 DUO– our easy device integration makes it a breeze to connect the KVM unit to RS-232 ready devices.

Applications for HDN-4 DUO

The HDN-4 DUO is an essential KVM switch for a variety of computer-heavy environments. Office buildings, transportation authorities, data centers, and more are all environments where HDN-4 DUO’s Ultra-HD KVM capabilities could prove vital for their detailed visuals and efficient control.


  • Switch KVM control on four connected computers from one workstation with two HDMI monitors.
  • Dual-Head HDMI support.
  • Supports resolutions up to 3840×2160 (@30Hz).
  • HDCP compliant.
  • Zero pixel loss with TMDS signal correction.
  • Supports all USB 2.0 devices, including keyboard and mouse.
  • Supports Windows, Mac and Linux.
  • Rack mountable in a standard 19 inch rack.
  • Supports control via RS-232.
  • Hot key commands for quick channel selection.
  • Independent (asynchronous) switching of KVM and peripheral USB ports. Users can scan a document and save in another computer.
  • Complete keyboard emulation for error free booting.
  • Front panel keys for manual switching.
  • DP and DVI supported with adaptors, backwards compatible with prior HDMI versions.
  • Server Collocation
  • Digital Signage
  • Education
  • Airports
  • Dealer Rooms
  • Banking/Finance
  • Hospitals/Medical Care
  • Control Rooms
  • Audio/Visual Presentations
  • Shopping Centers
  • Hotels/Resorts
Format HDMI 1.4
Input Interface (8) HDMI
Output Interface (2) HDMI
Resolution Up to 4K (3840×2160 @30Hz)
DDC 5 volts p-p (TTL)
Input Equalization Automatic
Input Cable Length Up to 20 ft.
Output Cable Length Up to 20 ft.
Input Interface (4) 3.5 mm Stereo Audio
Output Interface (1) 3.5 mm Stereo Audio
Impedance 600 Ohm
Frequency Response 20 Hz to 20 kHz
Nominal Level 0-1.0 V
Common Mode Rejection at 60 dB
Signal Type USB 2.0, 1.1, and 1.0 w/ internal hub
Input Interface (4) USB Type B
Output Interface (2) USB 1.1 Type A for KVM Devices
(2) USB 2.0 Type A Transparent
Front Panel Buttons < M1||M2 > source selection buttons
RS-232 DB9 Female – 9600 N,8,1, No flow control
Hotkeys via USB keyboard
Power External 100-240 VAC/ 5VDC4A
Dimensions 3” H x 5.75” D x 12.75” W
Weight 3.95 lbs
Operating Temp 23 to 95°F (-5 to 35°C)
Storage Temp -4 to 185 °F (-20 to 85 °C)
Humidity Up to 95% (No Condensation)
Emulation Keyboard and Mouse
Model # Description
HDN-4 DUOS 4-Port Dual-Head HDMI KVM Switch with 4K HD and audio. Includes: [HDN-4 DUO & (PS5VDC4A)]

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