OSD Black Subwoofers are our most advanced and best-performing subwoofers—designed to add no-compromise, accurate, bass extension to any audio system. Whether you are adding bass to an outdoor audio system or require the stealth of an installed, in-ceiling or in-wall solution, or simply want to enhance your surround sound or home theater system, OSD Black has the right product for you. Our advanced DSP, freestanding, subwoofers can be set up and controlled by our smartphone App. iPhone users can use the Pro version of the App to run extensive room-correction equalization that helps eliminate nulls and peaks, taking you one step closer to professional movie theater sound.