The Canton Pro XL.3 is a professional-grade active subwoofer designed for use in sound reinforcement and PA systems. It features a 15-inch woofer driver with a built-in 500W amplifier for powerful and accurate bass reproduction. The subwoofer has various connectivity options including XLR and RCA inputs, as well as an adjustable low-pass filter and phase switch for precise integration with the main speakers. It is built using high-quality components and materials to ensure durability and reliable performance.