Only one SoundLink speaker can be used with a particular phone or device via Bluetooth at any given time. There is no ability to play back from more than one speaker at once.
Individual SoundLink Color speakers play in stereo. They do not have any option to select for Left/Right/Mono playback.
Answered by Bose
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We have two of these speakers and tried this, my answer would be no, unless you have a way to allow your Bluetooth device to pair to 2 outputs simultaneously it won't work. The speaker will pair to 2 devices at the same time ( iPad and iPhone) and it will announce this when it powers on. The limits of the phone though only output to one Bluetooth receiver at a time as far as I concluded.