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I had one similar to that Archer. It has a built-in signal amplifier. Those are more like a matrix switch, any input can connect to any output. If you think about it, say you have a VCR connected to an input. Then you select that input on the other 3 dials. That signal is split 3 ways. It has to be amplified or it would get dimmer with each output you add.
If it was just one input selected to one output, then you wouldn't need an amplifier. But to send it across potentially multiple outputs, it needs an amplifier.
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