The Anker Soundcore Motion+ is a slightly better speaker than the Harman/Kardon Onyx Studio 6. The Anker can play stereo content without downmixing it to mono, and can get slightly louder than the Harman/Kardon. Its sound is more customizable thanks to the graphic EQ and presets featured in its companion app. It's also smaller, making it more portable. That said, the Harman/Kardon offers a better-balanced sound profile out-of-the-box, and can produce a more extended low-bass than the Anker. It also has slightly less compression present at max volume, resulting in cleaner audio at louder volume levels.
With One Year Warranty