JBL PartyBoost is compatible with both the Flips, allowing each pair to connect with the speakers of the same class in stereo mode for superior sound. These Flips can be linked but not through stereo mode. So when you have the old model and buying another new model to connect them for bigger sound effects is a no-brainer. However, be aware of this flaw: JBL PartyBoost speakers are incompatible with previous JBL technology found in Connect + speakers.