A bass-shaker is meant to be firmly attached to some surface such as a seat, couch or floor. The shaker houses a small weight which is driven by a voice coil similar to those found in dynamic loudspeakers. The voice-coil is driven by a low-frequency audio signal from an amplifier; common shakers typically handle 25 to 50 watts of amplifier power. The voice coil exerts force on both the weight and the body of the shaker, with the latter forces being transmitted into the mounting surface.
Related to Bass Shakers are a newer type of Tactile Transducer referred to as "Linear Actuators." These piston-like electromagnetic devices are said to transmit motion in a direct and lossless fashion. Linear Actuators directly and physically lift home theater seating in the vertical plane rather than transferring vibrations (by mounting within a seat, platform or floor). This technology is said to transmit a high-fidelity sound-motion augmentation, whereas "Shakers" may require heavy equalization and/or multiple units to approach a realistic effect.
There are other products now on the market which employ hydrualic (long-throw) linear actuators and outboard motion processors for home applications as popularized in "virtual reality" rides. These products differ radically from tactile transducers in that they require the manual composition and synchronized playback of motion signals, in addition to the standard soundtrack that the motion is meant to accompany.