Party without limits The JBL PartyBox Ultimate fills as much space as you’ve got with superior Original JBL Pro Sound, boosted with an immersive Dolby Atmos experience over Wi-Fi*. Because everyone at a party loves powerful sound whether they’re showing out on the dance floor or vibing on the sidelines. Along with sound that’s crystal clear even at its loudest, your guests will thrill to a huge, breathtaking lightshow of captivating starry lights, cool light trails, and strobe effects, all moving in sync with your beat.