Car audio question???? V v v v?

jimmy

New member
I have a couple questions. I cut the connector off an RCA cable and there's three wires there. Why? There's only the center pin and outside metal circle thing right? So why three wires behind the connector and not 2?

Also I took one wire(the non insulated one from the RCA coming from the deck), ONE wire, and stuck it in the amp through the RCA input right through the hole where the center pin goes through and music played. With only 1 wire. The insulated wire wasn't touching anything. How?? Im confused thanks for the answers.
 
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