XSUB12 500W 12" in-ground subwoofer brings the bass to your backyard so you can experience true surround sound even in the great outdoors. Designed to last with weather-resistant components, and since the sub is buried underground, it provides high-end audio with an elegant, unobtrusive design. It kicks out earth-shaking low-end with 500W of power, and the durable 12” polypropylene cone includes a rubber surround SMP500DSP Class D subwoofer amplifier is designed for use with higher wattage passive subwoofers such as in-wall subs that require external power. It is rack-mountable and 1U chassis. This sturdy sub-amplifier is not for the faint of heart. It serves up 800 watts of power peak and 400W RMS @ 4 ohms.