I use wire like that in my living room system. I just kept the outer jacket on and just stripped the ends. Honestly you could always combine two of the wires for a bigger positive, or just not use the third one.
I use wire like that for lower power systems. It looks like 18awg or close to that. For longer runs or for higher power apps I use a larger gauge. There is a chart somewhere that shows what you should be running based on the speaker load and length of the run
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