The JBL Xtreme 2 has come in very useful over the month I’ve now had it for. I have noticed it is a little quieter than the original JBL Xtreme at max volume. I’ve watched some YouTube videos about it and they explain how because the drivers are bigger, the speaker uses more energy.
https://www.amazon.com/JBL-Waterproof-portable-Bluetooth-speaker/dp/B07CVPZJTV