Features This System Includes: (3) FREE Microphones (4) Bose Panaray 802 Series IV Loudspeakers with (2) Bose SB-82 Flying Brackets (2) Bose MB4 Modular Bass Loudspeakers (1) Bose ControlSpace SP-24 Sound Processor (1) Crown XLS2500 Power Amplifiers Description Product Description This Bose Public Address System for Gymnasium and Stadium Sound Systems includes four 802 Series IV loudspeakers featuring eight proprietary 4.5-inch full-drivers, promising you a low profile, high performance portable speaker system. Because of the 802 Series IV's array technology, these speakers deliver a more consistent sound field than conventional speakers. Increase the low end of your stadium speaker system's performances with the Bose MB4 modular bass loudspeaker. The control is in your hands with the ability to target the low frequency bass to specific areas, and away from other areas, such as the front door. The rugged design and durability is a perk with this very portable speaker. The XLS Series of power amplifiers from Crown define the standard for live sound systems with unmatched performance, technology and affordability. This high-performance line consists of four models, each providing enormous power and flexibility thanks to the integrated PureBandTM Crossover System and PeakxTM Limiters. Class D amplifiers are notable for extraordinarily high efficiency and being well suited for driving difficult reactive loads such as subwoofers The Bose ControlSpace SP-24 sound processor makes optimizing 2x4 installed and portable sound systems easy. The SP-24 processor keeps the front panel interface simple with basic preset/scene recall and gain/delay operations. For full system access, the straightforward and intuitive SP-24 Editor software provides access to all signal processing settings and signal routing, whether connected live or offline.