The JBL PartyBox Ultimate's excellent Original JBL Pro Sound can fill a huge area—two basketball courts, to be exact. To produce a louder sound, it has two drivers and a mid-range speaker. Even the most ardent fans will find more than enough bass thanks to the two tweeters and two subwoofers, and Dolby Atmos* creates realistic 3D spatial effects. You will feel this thunderous sound as well as hear it.