No, When connected from multiple mobile devices ( up to 3 ) to one Harman Dual Sound enabled speaker, only the last one that connected will stay connected when enabling Harman Dual Sound. You can however connect from one mobile device to one of the 2 Harman Dual Sound enabled speakers, and activate Dual Sound afterwards. This will give you the option to interrupt the playback, in the same way as Social Mode works when connected to only one speaker.