Cut the desired length of speaker wire from its spool. Standard lengths are 3, 6 and 10 feet.
Strip 1/2 inch of the rubber protective coating that is around the copper wire from each end of the wire.
Unscrew the bodies from the 1/4 inch male plugs. This will expose two metal contacts.
Melt some solder on the longest contact of the plug; make a small puddle. Keep the soldering iron tip in the puddle until Step 5.
Stick one of the speaker wires into the hot solder. This should be the wire with a white stripe running along it. Bend the support prongs around your the wire for added security.
Solder the other terminal in the same way. This terminal will not have support prongs.
Repeat steps 4-6 at the other end of the cable.