Head Unit Install

[JDMSilviaSpecR]

I got my 96 240sx about a month ago and came with a ****ty stock tape deck. I know the previous owner had a cd player in there bcuz I saw cut outs for subs in the back and when I replaced the front right speaker I noticed it was an aftermarket speaker. I took my old head unit (cd player) out of my crashed 95 240sx and tried installing it in my 96 240sx. I put in three wires. The 2 huge clunker which I'm guessing connects to my speakers and then the black one right next to it which I'm guessing is the power. The antenna wire doesnt fit but do I need that for the cd player to work? Am I forgetting about any other wires? I checked the audio fuses and they aren't blown. Any help would be appreciated.