The New 2/3-Way Electronic Crossover by BOSS. Make other drivers green with envy by a loud and perfectly clear sound out of your vehicle. Top-shelf amplifiers are all you need to increase the volume of music without distortion as well as power your woofers or subwoofers. The wired remote subwoofer level control, mountable for easy access, has long been a popular feature on many of our amplifiers. The remote allows you to control the output level of the subwoofer(s) as needed for optimum sound according to your personal taste and listening environment. A subsonic filter is designed for use on subwoofers. Since not all subwoofers can reproduce the same low frequencies, the subsonic filter can be set for optimum bass response in order to keep the driver playing efficiently.