I connected it to the speaker all the time. My MP3 player comes and goes. One nice thing about this cable is that there is no hum or feedback when the MP3 player is not connected. I use this every day and it works flawlessly. Update: 8/2015: I have this under my sofa to connect my MP3 player. It sits and is used every day, at least for a short time. Still works like new.
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