AuraSound AST-2B-4 Pro Bass Shaker, Tactile Transducer, 50-Watt, 5.4 x 2.2" Frame, Impedance @ 4 Ohms and 40 Hz Resonance Frequency, This PRO version replaced the AST-1B-4 which is a consumer version
AuraSound AST-2B-4 Pro Bass Shaker Tactile Transducer. - YouTube