The versatile S1.8SW is a 3-Way on-wall surround speaker. The S1.8SW is engineered for exceptionally smooth off-axis performance and a 6.5" woofer provides high power handling and exceptionally smooth mid-bass. The S1.8SW incorporates exclusive, patented S4X crossover and driver-control technology, which makes possible virtually perfect integration of drivers which are ideal for their intended frequencies. S4X also provides greatly increased control over frequency response, phase, and impedance, resulting in superior performance and imaging. Because of S4X technology, any of Induction Dynamics' speakers can be used to build a custom home theater system. Your S1.8SW can be combined with any of our center and surround speakers, be they in-wall, on-wall, or free-standing.