The QSC AcousticDesign™ AD-S12 is a surface mounted low impedance, 12" two-way loudspeaker system, ideally suited for a wide variety of foreground and background sound reinforcement applications. The AD-S12 features a high quality 12" weather treated paper cone woofer on a 2.5" voice coil. A carefully selected 1" exit, 1.4" compression driver perfectly matches the sensitivity and performance of the woofer for outstanding full-range reproduction.