Recommended for audiences up to 500. 24-speaker articulated line array delivers 180-degree horizontal sound coverage. Produces the most consistent tonal balance with little volume drop-off over distance. System's interconnecting pieces allow for efficient transport, easy setup and breakdown. One B1 bass module included for enhanced low-end performance. Like the original, award-winning Bose L1 system, the Model II sound system is an all-in-one innovation that replaces conventional monitors, mixers and PA speakers. And this professional sound system is packed with proprietary Bose technologies designed to improve your amplified sound.