The WHARFEDALE's TITAN SUB A12 is a powerful active subwoofer system that delivers high-quality audio in any performance environment. To provide precise accuracy and high output, the Titan Sub-A12 blends the latest technologies, materials, and design topology. This powered speaker is a 12-inch band pass active subwoofer with a robust bass response. A built-in 250 watt (continuous) and 500 watt (peak) amplifier accepts stereo or mono line level inputs through dual balanced XLR-1/4" "combo" connectors, as well as a unique single channel 4- speaker level input via a 1/4" phone jack for use with a typical sound reinforcement amplifier (when the internal amplifier is not used).