Ultimate Ears WONDERBOOM PLAY vs Ultimate Ears BOOM 4

The Ultimate Ears BOOM 4 and the Ultimate Ears WONDERBOOM PLAY have very different designs and strengths. The cylindrical BOOM 4 has a dual-driver design that helps create a wider soundstage, with better directivity. It can also get louder with less compression. While its default sound isn't quite as balanced as the WONDERBOOM PLAY, it features a graphic EQ and presets in its companion app. The WONDERBOOM PLAY has a more balanced default sound, with a less recessed treble range, but it's limited by its single-driver design, which caps its max volume and compresses a lot as you turn the volume up. It's better for handheld use, though, thanks to its hand-carrying strap and more ergonomic control scheme. It also has a slightly longer battery life.