1、Precise Control: Pulse width modulation PWM simplifies the power supply. It not only eliminates output current sense losses, but also eliminates all secondary feedback circuits, resulting in precise control of output voltage and current. 2、Variable Low Pass Filter: A low pass filter is an electronic circuit that eliminates all notes below the filter frequency setting. 3、Variable Bass Boost: Variable bass boost allows you to adjust the bass to your liking within the boost range to meet your usage needs. 4、With Treble Speaker: 10 inch powered under seat car subwoofer is equipped with a tweeter, and a high strength speaker shield to better protect the speaker. 5、Easy Installation: The under seat design of this subwoofer allows for easy installation in your vehicle without taking up valuable space.