Flip 5 uses JBL PartyBoost, while other recent JBL speakers use JBL Connect+. Therefore, you cannot link the Flip 5 with other JBL speakers besides the Flip 5 (until JBL releases new speakers that have the PartyBoost technology). Very disappointed as that’s the reason I purchased the Flip 5 (and waited for it to come out).
https://www.amazon.com/JBL-Waterproof-Portable-Bluetooth-Speaker/dp/B07QK2SPP7

