Velodyne Acoustics ULD-15 is a subwoofer system representing the state of the art in accurate bass reproduction. It features a very powerful 400 watt RMS amplifier, high and low pass crossovers, input and output jacks, level control, servo interface jack, and speaker terminals. The system is easy to install and operate, and it comes with a 25' phono cable for connection from controller to woofer cabinet, and a 3' patch cord for connecting the controller to your pre-amp. The ULD-15 is a versatile subwoofer that can be used in a variety of applications, from home theater to car audio.