The Technical Pro Xtreme-1501 15" Professional Powered Subwoofer erupts with power, and these subwoofers have great sound clarity. With a huge 90 Oz. Magnet and 1,500 watts of power, this sub will put out the most extreme bass around! This is a true all in one powered subwoofer because it has a built in amp to power the sub, and an additional (2) powered outputs, to power satellite speakers. The (2) powered outputs have a built in high pass filter. The benefits of the Technical Pro Xtreme series is that these enhance and ease any application by eliminating extra wiring, and not having to have any amplifiers. This sub is perfect whether you stack 4 of them for use in big wedding hall, or whether you just need one of them for use in smaller rooms. This is the newest creation from Technical Pro. The Xtreme15 replaces the Bass-15 but has been enhanced with a higher quality amp, better quality parts, and more accurate sound reproduction.