With a natural working range of 5-200Hz a true tactile transducer is designed primarily to move structure, not air, and to provide a much more direct method of sound perception. In other words: Tactile sound is the sound you feel in your body - vibrations from explosions, earthquakes, trains, planes and similar powefull sound effects .

This newcomer has something quite interesting and different.

John L. Yi from Crowson informed me:

"Instead of suspending a mass (piston) like "shakers" on the market, Crowson Tech pre-load a spring system with the weight of the couch and customer, and use the mass of the earth below to push against. Instead of an inertial shaker we use an electromagnetic linear actuator.

This is a more efficient use of energy and the spring system design prevents any "bottoming out" which is experienced in many other products. Powered by 500 watts, the TES 100 is capable of roughly 3 times the lbf of the closest competitor at frequencies under 10hz! For more conventional users, even 50 watts RMS is sufficient for significant effect."
 

The TES 100 transducer

http://www.clarksynthesis.com/

http://www.thebuttkicker.com/

Used by Disney and Guiness World Record.

Since its introduction in late '99, ButtKicker™Shakers have been sold in over 26 countries around the world.  

http://www.aurasound.com/

Want to feel your music? The Bass Shaker Plus and Bass Shaker products allow you to experience every thump, thrust and shake...the way bass sound was originally intended. Aura's patented technology preserves the sound pressure levels so there's no distortion while enhancing the bass energy delivered from your stereo. We're taking surround sound to another level.....

Monacor Bass Rocker

http://www.monacor.de

Compared to the above "big ones" this is just a toy. Anyway it is a lot cheaper (approx. 80 US dollar) and it works OK. Monacor describes their BR-25 as a "Bass Rocker" designed to be used in a car. I have no car, and therefore mounted 2 of them under my big sofa. They are connected in series (each 4 ohm) and driven by a 200 Watt amp with the 0.1 signal from my Proceed AVP. 

The result is overwhelming. I can only imagine what the bigger ones can do any better. The Pearl Harbour attack is a physical experience! Unprepared guests are shocked and thinks it all comes from my modest sub. A big advantage is that the shaking and rumbling is limited to the sofa. Nothing is heard when standing up and thus this is a really neighbour friendly "speaker". Anyway I still use my 15" sub-woofer - the BR-25's do not substitute a good sub.

From the Monacor site:

"Special technology for structure-borne sound production. By mounting to a seat or also to a floor or dance floor capable of vibrating, the impression of a powerful bass is generated which can physically be felt, independently of the perceived volume. Especially suitable for car HiFi but also to be used as
excellent completion of home cinema and home HiFi systems as well as multimedia applications like PC games. Easy mounting due to screwing to the lower or rear side of the seat. Connection to a suitable power amplifier or via
basic passive crossover network as for subwoofers, or even better via an individual amplifier. As for common bass speakers, series or parallel connection of several BR–25 units is possible. Free air resonance 40Hz (varies due to mounting to different surfaces), frequency range approx. 30-300Hz, even mounting surface of at least 110x110mm, dimensions
138x138x56mm, weight 1.5kg"

http://www.soundbug.biz/

This British-designed innovation is about the size of a computer mouse and turns any hard surface into a speaker!

Plug it into your music device, stick the sucker to a door, window or desk, hit play and your surface of choice starts singing back at you!

The main component of the Soundbug is a tiny piece of a material called Terfenol-D, which was originally used by the US Navy for sonar work. The Terfenol is placed within an aluminium case and a coil wrapped round it. When electricity is passed through the coil the Terfenol expands slightly creating a massive force of 400 pounds (PLEASE NOTE - IT DOES NO DAMAGE TO THE SURFACE ITS ATTACHED TO)– when its attached to a flat surface it transmits electronic signals into mechanical energy causing the flat surface to vibrate and broadcasts the sound.

75-db output (depending on surface). 
Dimensions – 95,mL x 50mmW x 35mmD. 
Weighs just 180 grammes (including batteries).

http://www.hometheaterhifi.com/volume_4_2/tactile.html