The Harman Kardon Onyx Studio 9 is a premium portable Bluetooth speaker known for its powerful sound, stylish design, and convenient features. It delivers a room-filling audio experience with deep bass and clear highs thanks to its 50W RMS output power, 120mm woofer, and two 20mm tweeters. The speaker also incorporates Self-Tuning Technology for optimal sound calibration based on its environment and Constant Sound Field Technology for enhanced vocal clarity and a wider soundstage.