Hi classicalmusiclover,
Welcome to the Community, thanks for joining us!
When you connect a cable to the headphones output on your Wave it will automatically mute the speakers on the Wave. There isn't any way to change this behavior, your Wave will always mute when you connect a cable to the headphones output, so you would not be able to connect the SoundLink so both it and the Wave play together.
Let me know if you have any further questions.
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