One of the banana plugs just came loose. These were factory terminated. I'm assuming these are soldered on. I don't own a soldering gun and solder. Can I crimp it with pliers? Probably not. Guess I have to buy a cheap soldering gun.
Soldering is best (search the forum for World Domination and my guide to soldering bits together for a beginner, it is fun), crimping will not work and the easiest are the banana plugs that have a little screw in them, or two bits that screw together and that holds the end of the wire.