The BOSE's PANARAY 402 SERIES IV is a passive speaker with a full-range driver array that eliminates the need for tweeters and crossovers, resulting in unparalleled vocal clarity and durability. With a wide 120° x 60° coverage, the Articulated Array design can reduce the number of required loudspeakers, while the 73-Hz low-frequency range can reduce the requirement for subwoofers, giving a cost-effective option for various indoor or outdoor installed sound-reinforcement applications.