These were acquired more than ten years ago with a portable CD player and they have been used with various cassette players, CD players, minidisc players, and MP3 players over the years. One of the wires broke near the plug meaning sound only came from one of the speakers. Buying and soldering on a new plug was a possibility, but an easier option was to cut the end off a spare stereo jack-to-jack lead from my box of cables and replace the whole cable. Nice straightforward job. The trickiest part was tying strain relief knots in the exact same place in each cable so that the cable ends were the same length.