HDMI splitter vs. HDMI switch: They actually serve opposite purposes - CNET
MA-U42 - 4 x 2 HDMI matrix with Amplifier & USB Hub - CYP Europe
FERRISA 4x2 HDMI Matrix Switch,4 in 2 Out Matrix HDMI Video Switcher Splitter +Optical & L/R 3.5mm Output,Support Ultra HD 4K x 2K,3D 1080P,Audio EDID Extractor with IR Remote Control : Amazon.co.uk:
Matrix Switch - 4x4 HDMI w/Audio - 4K 60 - Video Switchers | StarTech.com United Kingdom