The SW4.IW Dual 10" in-wall subwoofer with its patented filter circuit and excursion limiter generates true deep, thunderous bass--the foundation of a superb sounding home theater system. The SW4.IW features the Stud-Grabber patented mounting system with suspension springs that attaches loudspeaker directly to wall studs, eliminating vibration on drywall, a problem common to wall-mounted subwoofers. A sealed, heavy-duty one piece aluminum enclosure ensures consistent sound quality. The SW4IW can be used with any Induction Dynamics loudspeaker to add explosive impact to your surround sound system.