CEDIA 2019: SIIG Presents 4×4 4K HDMI Matrix with Video Wall ProcessorSeptember 13, 2019 | Home / September 13, 2019 rave-video / CEDIA 2019: SIIG Presents 4×4 4K HDMI Matrix with Video Wall Processor CEDIA 2019: SIIG Presents 4×4 4K HDMI Matrix with Video Wall Processor