I have 4 speakers wires:
- left red wire
- right red wire
- left black wire
- right black wire
I want to take those 4 wires, and make a 3.5mm stereo RCA plug for my iPod. So that I will be able to play the songs from my iPod to the speakers.
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Your iPod was designed to drive headphones, not speakers. It outputs a line-level signal which just carries signal. It has no power to drive a speaker.
You need to send the signal from your iPod to either an amplifier or a powered set of speakers. Both of which will probably take a 3.5mm directly.
But just for information's sake, there are many different "flavors" of 3.5mm jack. And if you were to connect speaker wire to a 3.5mm jack for whatever reason, how it gets connected depends heavily on which type of jack you are using.