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Key Digital KD-MS4x4G
4x4 4K HDMI Matrix Switchers with Independent Audio Switching

Part #: KD-MS4x4G
This product has been discontinued

Top KD-MS4x4G Specifications
  • Input: 1 HDMI Connector, Type A, 19 Pin Female
  • Outputs: 1 HDMI Connector, Type A, 19 Pin Female / Balanced/unbalanced line level audio on 6-pin
  • terminal block / Drives 2VRMS line audio input with a sampling rate of 192KHz / RCA female for digital
  • audio following SPDIF format (IEC 60958) / Supports sampling rate up to 192KHz
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Key Digital's KD-MS4x4G is an HDMI matrix switcher that performs independent audio switching, balanced and unbalanced audio, and audio de-embedding of analog pulse-code modulation (PCM). This matrix switcher supports 18Gbps of signal bandwidth. Using HDCP 2.2 for signal and routing distribution, the KD-MS4x4G ensures that your signals go to authorized devices only. This matrix switcher distributes 4 HDMI source signals to 4 displays of your choosing. Both analog and digital audio outputs are controlled individually. This ensures that HDMI outputs can be controlled independently, allowing you to employ them for other uses within your professional AV system. 

The KD-MS4x4G ships complete with a 12V DC power supply, rack ears for mounting, a remote control, and a total of five 6-pin terminal blocks. Other key features of the KD-MS4x4G include the following:

  • HDMI Matrix Switching: 4 HDMI sources to 4 HDMI outputs
  • Ultra HD/4K Support: 4096x2160 or 3840x2160 24/25/30/60hz at 4:4:4 (signals up to 18Gbps bandwidth)
  • HDR10 (High Dynamic Range): Vivid images via wide range of luminance levels
  • Resolution Support: Supports all SD, HD, and VESA (VGA, SVGA, XGA, WXGA, SXGA, UXGA) up to 4096x2160p
  • Deep Color Support: Up to UHD/4K 60Hz 4:2:0/12 bits, 60Hz 4:2:2/12 bits
  • Independent Audio and Video Matrix: Output HDMI and audio ports may switch together or independently
  • Full Buffer System: Manages TMDS re-clocking / signal re-generation, HDCP authentication to source and display, and EDID control handshake
  • EDID: Internal library with 15 internal EDID configurations per input, in addition to native EDID data for any output or display
  • TMDS Re-Clocking: Supports long-range HDMI connectivity using Key Digital HDMI cables
  • Lossless Compressed Digital Audio: Dolby TrueHD, Dolby Digital Plus, DTS-HD Master Audio, and Dolby Atmos
  • Control: Front panel buttons/LEDs, Serial IR, Optical IR, RS-232 Control, and TCP/IP Control
    • Control System Support: Key Digital app ready. Key Digital Management Software Pro (KDMS Pro) ready, Compass Control Pro ready. Fully controllable by all IR, RS-232, and TCP/IP supported control systems via open API.
  • Key Digital App and KDMS Pro Ready: Scan and detect population for pre-built GUI and TCP/IP control via Key Digital App and Key Digital Management Software Pro (KDMS Pro) PC Software


  • Video Bandwidth: TMDS bandwidth 10.2 Gbps
  • DDC Signal (Data): Input DDC Signal - 5 Volts p-p (TTL)
  • HDMI Video/Audio Signal: Input Video Signal - 1.2 Volts p-p
  • DDC Communication: EDID and HDCP Bi-directional buffering to Display and Source
  • K-Factor: 0.22% @ optimal EQ Video Isolation (Crosstalk): -45dB @ 5MHz
  • Analog Audio Max Output Level: 4dBu on 150k , DC coupling
  • Audio Bandwidth: 20Hz to 20kHz @ 0dBu
  • TND + Noise: 0.33% @0dBu @ 1kHz PCM Max Input Level: 1Vpp on 75 , AC coupling
  • PCM Max Output Level: 1Vpp on 75 , DC coupling
  • Wired IR: Modulated IR signal input, 0-5V TTL or -10 to +10V
  • Power: 12V/3.3A (40W) AC Power Supply with Grounded, 2.1mm ID DC Power Jack with screw in type. General Specifications
  • Regulation: CE, RoHS, WEEE
  • Rack Mount: 1U, 1 Rack Width (rack ears included)
  • Enclosure: Black Metal
  • KD-MS4x4G Dimensions (LxWxH): 17.32"x5.78"x1.72"
  • Shipping Carton Dimensions (LxWxH):23.4"x8.54"x2.36"
  • Product Weight: 6 lb
  • Shipping Weight: 9 lb
  • Accessories: IR Remote, UL Certified Power Supply
  • Warranty: 3 years

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