Splitters contain no electronic devices and don't require any power, making them "passive" instead of "active. " Because of this, they can be connected in reverse without any damage. A splitter separates a signal into two outputs, each of which may feed separate devices. Now that you know you can't use an HDMI splitter (our guide) in reverse, and you have to use an HDMI switch instead, you're probably wondering what the difference is between the two and why they don't work in the same way?Can a coax (TV antenna) splitter be reversed, to feed two antennas into one cable? Where I am no external antennas are allowed, so we all have them in our garage rafters and attics. I'm still pulling in MOST OTA channels by pointing to the "antenna farm" 30 miles NE of us, but there's a handful of. An hdmi splitter is a device that allows you to split the signal from a single hdmi source to multiple hdmi outputs.