Atlantic Technology - Dual 8" Passive Thin Bezel In-Wall Subwoofer - IW-28SUBThe IW 28 SUB from Atlantic Technology is an in wall subwoofer that uses dual heavy duty 8" woofers to deliver rich, vibrant bass to custom installed audio systems. Boasting amazing hookup flexibility, the IW 28 SUB can either be used passively, driven directly off the receiver's front Left Right speaker outputs by utilizing the IW 28 SUB's on board low pass crossover, or it can be driven actively by using a power amplifier such as the Atlantic