If the wire and lug were properly tinned there should be enough solder to completely cover the eye and hold the wire in place.
Solder speaker cable ends.
Tinning the tips of stranded wires holds the fine wires together and makes it easy to connect them to screw terminals or other connectors.
Most connectors are brass on the inside but there are copper based connectors that are either nickel or gold plated.
Soldering iron or heat source there is a conversion for a butane lighter that works well rosin core solder.
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In europe lead based solder has been outlawed for a number of years.
Bare wire connections are fine if the wire is silver.
This also ensures that all of the wires are making an electrical connection.
People suggested tinning the stripped speaker wire ends with some kind of solder and then soldering each of the ends to a spade connector.
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Take the soldering iron away after 1 2 seconds and repeat if needed.
Clear and well ventilated space to work in.
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.
While lead based solder is still in use most solder is lead free and high end solder uses silver.
For electronics the thinner solder would be better.
Only apply a small amount of solder on the very end of the wire.
Keep the soldering iron away from anything flammable and do not touch it to your skin or any other part of your body.
For speaker wire any thickness of solder will do.
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Tinning is a process of using a soldering iron to melt solder around a stranded electrical wire.
Hold your iron on the lug until the solder begins to flow and then quickly insert the wire through the eye of the lug.