What is the max HDMI cable length for 4K60 seamless matrix?

For 4K60 4:4:4 signals, a standard passive HDMI cable is typically reliable up to about 5 meters. Beyond that, you should use active solutions.

VISSONIC offers several options for extending 4K60 signals:

HDBaseT Extender for 70m (VIS-HD70T/R) — transmits 4K60 up to 70 meters over a single CAT6/6a cable

HDBaseT Extender for 100m (VIS-HD100T/R) — extends 4K30 up to 100 meters or 4K60 up to 70 meters

HDMI/VGA to HDBaseT Wallplate — convenient wall-mounted transmitter for conference table connections

The VIS-MX modular seamless matrix switchers (from 8x8 to 144x144) support HDBaseT output cards, so you can connect displays up to 70-100m away using standard CAT6 cabling — much more practical than running long HDMI cables.

Practical recommendation: keep HDMI cables under 3m for 4K60, use HDBaseT extenders for everything else. The matrix outputs with HDBaseT cards and HDBaseT receivers at the display end give you the cleanest installation.