Ultimate Ears BOOM 3 vs BOOM 4

The Ultimate Ears BOOM 3 and the Ultimate Ears BOOM 4 are, by and large, the same speaker with one difference that will appeal to many users: the previous generation charges via a micro-USB cable and the new generation opts for USB-C charging instead. Beyond this, differences in performance are marginal at best. The newer iteration features slightly more bass (though it's still far from bass-heavy) and a less rolled-off treble. That said, it has a slightly shorter continuous battery life. Users who already own the BOOM 3 and aren't desperate for USB-C charging would be advised to hang on to their current speaker.