I have a nice set of older computer speakers (5.1) and wanted to convert them into a single cable to allow me to use them on a subpar tv i'm buying for my personal gym. The speakers are three wires, Black Green & Orange. I found a tutorial on how to do it at https
/www.techwalla.com/articles/how-to-turn-three-computer-speaker-cables-orange-green-black-into-one-cable
I have no clue what to buy though, as it doesn't really elaborate well (when it comes to audio, I know very little). Any help would be greatly appreciated.
edit; Also, if anyone could point me in a direction for the best quality and perhaps highest sound range speakers that can connect to a TV as well as letting me plug in my iPhone, that would be greatly appreciated. My budget is 100 or less.

I have no clue what to buy though, as it doesn't really elaborate well (when it comes to audio, I know very little). Any help would be greatly appreciated.
edit; Also, if anyone could point me in a direction for the best quality and perhaps highest sound range speakers that can connect to a TV as well as letting me plug in my iPhone, that would be greatly appreciated. My budget is 100 or less.