Backwards compatibility

Because the Charge 6 relies on JBL’s newer Auracast platform rather than PartyBoost, it cannot wirelessly link with older JBL speakers such as the Charge 5, which is a notable drawback for listeners who already own a legacy multi-speaker setup.

Reviewers are disappointed that the Flex 2 cannot be wirelessly paired with the original SoundLink Flex, meaning existing owners must buy a second-generation unit if they want a matched stereo pair.