For electronics the thinner solder would be better.
Solder speaker cable ends.
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Bare wire connections are fine if the wire is silver.
Most connectors are brass on the inside but there are copper based connectors that are either nickel or gold plated.
This also ensures that all of the wires are making an electrical connection.
For speaker wire any thickness of solder will do.
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Keep the soldering iron away from anything flammable and do not touch it to your skin or any other part of your body.
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Clear and well ventilated space to work in.
Continue until you have soldered each of the 4 ends of the speaker wire.
While lead based solder is still in use most solder is lead free and high end solder uses silver.
Soldering 1 4 ts trs cables.
Tinning is a process of using a soldering iron to melt solder around a stranded electrical wire.
Only apply a small amount of solder on the very end of the wire.
Soldering iron or heat source there is a conversion for a butane lighter that works well rosin core solder.
Tinning the tips of stranded wires holds the fine wires together and makes it easy to connect them to screw terminals or other connectors.
Don t use too much solder.
Take the soldering iron away after 1 2 seconds and repeat if needed.
Another person said tinning would reduce conductivity and to simply screw down the naked wire into a screw type connector using a banana plug and put some silicone sealant over the finished connector.
If the wire and lug were properly tinned there should be enough solder to completely cover the eye and hold the wire in place.