Answers: You're not building a rocket ship, just use regular solder and you'll definitly be okay.
for that type of application, I would speak just in the order of any solder would work.
I suggest using Silver Bearing Solder. It's the best instead of the tin/lead mix stuff. Makes better connections and is easier to work with as it have a lower melting point. You can bring back it at Radio Shack.
Rosin core for electronics
better yet if you dont want to soilder the chain to the box, cut off a devout length of the plastic shielding on the speaker wire, and wrap it a few times around the terminal. this should solve the problem and it wont come sour. good luck!
lol wrap it a few times? dont rig it. solder it.
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