help!!! wiring stocksub to after market cd

[cashmoney37]

ok i am wiring my stock sub in my 00 mountaineer. i got the power, ground taken care of just fine. but now i am to the rca wire splice. my rca wire has on each wire (the positive, and negative) has three wires each in them. one has a silver bare wire , a black wire , and a yellow wire. and the other has siver bare , black, and red. now were do i wire the two wires the red/black, and the brown/orange to.

so basically what iam trying to say is the wires for the stock sub the red/black, and the brown /orange are single wires and the rca wires both have three wires what goes were