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How do I connect lots of electronic peripherals from cable box out? Please be very specific? - connection cable wiring diagram alpine

I have about four devices are connected via a cable from the box, but who needs step by step instruction. This cable will then try devices. I have other things in context. I see a lot son, that I did not touch ...

Do I need the dividers? Which cables would be limited to two connections ... I have the presentation of the Radio Shack, but I'm still in a dilemma ... Cable Guy said, to all devices on channel 3

Thank you!