Powerful Compact Subwoofer – Small but mighty, this compact sub packs a powerful punch to enhance your car audio experience. With a max power handling of 250 Watts, the TS-WX400DA produces a dynamic bass response, adding depth to your ride. Built-In Class D Amp - TS-WX400DA is designed with a built-in high bandwidth, high output and low distortion 250 Watts Class D amplifier. The high efficiency and low heat output of this amp are optimal to power this dynamic sub. Selectable “Bass Mode” – Featuring two Bass Modes: Deep and Dynamic, customize the bass output to produce bass you can feel. Deep mode achieves rich, deep bass quality, while dynamic mode emphasizes powerful, strong and dynamic bass sounds. Sensitivity - The sensitivity ratings of 72 dB (Deep) and 73 dB (Dynamic), ensure that the speaker produces clear and loud sound even with lower power inputs. This means you can enjoy your music without distortion, even at higher volume levels. Easy Installation – The TS-WX400DA is a uniquely compact speaker that allows installation in a wide range of vehicle applications. Installing the subwoofer under seats or in small spaces is ideal for this powered subwoofer. Instruction and Operation - Please see the Owner’s Manual for installation information and operation details found near the bottom of this page (Technical Specifications