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Connect 621 UHD 2.0 - HDMI switch 4K 60Hz - 4 in / 1 out

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With this HDMI switch 4K, you can connect up to 4 devices to the HDMI input on a TV or beamer with just one cable. The Connect 621 UHD 2.0 has an additional digital audio output for connecting an AV receiver with a single cable. Select the desired audio format (2.0 / 5.1 / 7.1). Includes separate infrared receiver to control the HDMI switch 4K when it is out of the line of sight. Supports ARC to prevent lip-sync problems.

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  • Product description
  • Points of sale
  • Technical specifications
  • Downloads
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Connect 4 devices with just a single cable to the HDMI input of a TV or projector.

  • Enjoy the latest Ultra HD content and watch Netflix or a Blu-ray movie in 4K, while maintaining ultimate contrast and beautiful colours.
  • Suitable for the latest Ultra HD 4K60 resolution (3840 x 2160/60 Hz), High Dynamic Range (HDR), Deep Color and 4:4:4 chroma colours.
  • With additional digital audio output to also connect your AV receiver using a single cable, with the option to select your desired audio format (2.0/5.1/7.1).
  • Supports Audio Return Channel (ARC) to avoid lip-sync problems.
  • Supports Dolby Atmos and DTS:X and all other common audio formats.
  • With built-in repeater and equalizer to correct any signal loss.
  • Switches automatically and/or using remote control.
  • Supports HDCP 2.2 for playback of protected 4K Ultra HD content.
  • Separate IR receiver for operating the switch if it is not within line of sight.
  • Suitable for simultaneously connecting 4 HDMI devices to your TV.

The Connect 621 UHD 2.0 enables you to connect up to 4 devices to your TV with one cable. This HDMI switch has an additional digital audio output that enables you to also connect your av receiver using a single cable, with the option to select your desired audio format (2.0/5.1/7.1). The included separate infrared receiver enables you to operate the switcher when it is positioned out of sight.

The UHD 2.0 range is suitable for connections with the very latest Ultra HD equipment, provided these are equipped with both HDMI 2.0 and HDCP 2.2 security.

HDMI 2.0
Compared to HDMI 1.4, the main improvement of HDMI 2.0 is its higher bandwidth (higher data rate), enabling 4K with higher frame rates and HDR.

The amount of data that can be sent is increased from 10.2 Gbps to 18 Gbps. This makes it possible to display 4K using a frame rate of 50-60 frames per second, 4:4:4 and HDR. HDMI 2.0 also offers support for a larger colour range (12-bit instead of 8-bit) and Dual View.

2.2 4K Ultra HD content is increasingly becoming the standard. Due to this development in digital video technology, the current copy protection, HDCP, has evolved into HDCP 2.2. To play the latest Ultra HD content (4K films or broadcasts) in the best possible image quality, all your AV equipment in the same chain must support this HDCP 2.2 security.

So, this does not only apply to the source and your TV. If, for example, you route your HDMI signal via an HDMI switch, splitter, AV receiver or soundbar, they must all be HDCP 2.2 compliant. If that is not the case, the material will not be displayed in the highest possible resolution (1080p instead of 4K) + the corresponding image quality OR will sometimes not be displayed at all.

Well prepared
Marmitek UHD 2.0 switch gear enables you to prevent these (future) problems and to make the most of your (existing) equipment. This range is HDMI 2.0/HDCP 2.2 compliant and therefore the best solution for connecting your HDMI devices and TVs.

“HDR stands for High Dynamic Range. HDR provides images with greatly enhanced brightness and higher contrast (brighter white and deeper black). Combined with better colour rendering, this creates a more realistic and natural image. In order to enjoy HDR, your TV does need to support the HDR feature. Material displayed in HDR quality (such as 4K Blu-ray, Netflix and YouTube) can then easily be played on your TV. HDR does not add more pixels, like 4K Ultra HD does, but enhances the pixels that are there.“

Points of sale


AV input 4 x HDMI
AV output 1 x HDMI
Digital audio output 1 x Toslink (optical)
Analogue audio output 1 x Stereo 3.5 mm jack
RS-232 1 x 3.5 mm


Video resolution Max. 2160@60Hz
3D formats All 3D formats
PC resolution Max. 2560 x 2048 Hz
Video bandwidth 18 Gbps
Clock frequency Max. 600 MHz
HDMI standard HDMI 2.0b, HDR, CEC, EDID, DVI, Deep Color 36-bit and all 3D formats
HDCP standard HDCP 1.4/2.2
Colour formats RGB and YCbCr 4:4:4, 4:2:0 or 4:2:2
Colour depth Max. 36-bit


HDMI audio DTS-HD Master Audio, Dolby TrueHD, Dolby Atmos, DTS:X, Dolby Digital/AC3, DTS 5.1 and PCM stereo


Dimensions (h x w x d) 21 x 182 x 85 mm
Weight 366 grams
Ambient temperature +0 to +40 °C
Humidity 20% to 90%
Power 100-240 VAC 50/60 Hz, 5 VDC adapter

What distinguishes this product from the Connect 620 UHD 2.0?

Can I also change the source remotely?

What can I do with the EDID switching option?

The remote control does not work.

No (or poor) image and sound.

No proper 3D picture.

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Connect 621 UHD 2.0 - HDMI switch 4K 60Hz - 4 in / 1 out