Rockville ROCKGHOST V2 is an 11-inch powered car subwoofer that delivers deep, clear bass without vibrations or unwanted noises. It fits perfectly inside your spare tire, taking up no trunk space, making it a great solution for those who want great sound without sacrificing space. With its built-in amplifier, installation is simple and clean, and the included remote control allows you to adjust gain, bass boost, low pass filter, and phase shift for a customized listening experience.