The RS-42 II offers up no-compromise you-are-there surround sound from a smaller design. In fact, because this speaker perfectly matches what you hear with what you see, you"ll find it simply irresistible. The RS-42 II is complete with proprietary Tractrix Horn technology, which produces a unique combination of precision, clarity and effortless power. Keyhole bracket and dual threaded inserts for easy installation Sleek, contemporary cabinet Specifications - Frequency Response - 62Hz-24KHz +- 3dB Power Handling - 75W RMS / 300W Peak Nominal Impedance - 8 ohms compatible High Frequency Crossover - 1700Hz High Frequency Drivers - Dual 1 (2.54cm) Titanium diaphragm compression drivers mated to 90 x 60 square Tractrix Horns Low Frequency Drivers - Dual 4 (10.2cm) Cerametallic cone woofers Enclosure Type - Bass-reflex via dual side-firing ports Inputs - Single binding posts Mounting - Keyhole bracket and dual 1/4-20 threaded inserts Unit Dimensions - 10 H x 10.75 W x 7.75 D, Weight - 11.9lbs.