Clark Synthesis TST239 Silver Tactile Transducer Bass Shaker For years, Clark Synthesis Tactile Transducers have given people what no other product cananother dimension to movies, music, and gaming. When attached to furniture or platforms, these transducers turn sound into vibrations, allowing you to actually feel the tremble of earthquakes, the rumble of engines, or the kick of a drum. With a Clark Synthesis Transducer, youll feel sound and start to experience movies, music, and gaming like never before! Continuous power handling: 100 watts | Recommended Amplification: 75 - 100 watts at 4 ohms | Frequency Response: 15Hz to 17kHz Dimensions: 8 in. diam. x 2.25 in. high Made in USA! ***Requires a Surround Sound Receiver AND in many cases a seperate mono amplifier (100 - 150 Watts into 4 ohms for 1 unit | 120 - 150 Watts per Channel into 8 ohms for 2 units). Please reference wiring diagrams for more information.