We had failure of 4 units in 30 days in the media room we installed so we replaced them with 8 units Buttkicker LFE Electromagnetic Transducer with several amps. The media room makes you feel like your on the plane, train, or aircraft carrier. We had installed 4 of these units only to have to replace all 4 units within 30 days after they stopped working and were smoking. We had the expert that taught me to make sure we correctly installed them and they were. The average person that installs speakers of this 4 ohm type do not have them correctly installed. The average person is use to installing 8 ohm speakers which are a little different. If the units ohm's output is not matched to the speakers ohm's input it can cause problems or failure I have been told.

If you are looking for a powerful bass experience, I recommend you look elsewhere. I''''ve purchased two of the TST329-Gold models, both from Smarthome, and both have failed miserably in my application. My first clue *should* have been the 139W power rating. Notice that this shaker is completely plastic. Plastic is NOT a thermal conductor, so if you feed your shaker 139W where does the heat go? Into smoke, in my case. Right out the little black vent in the top of the device.. I assume the metal bolt connection in the bottom is supposed to act as a heat-sink, but in my case, that hasn''''t been true. On my first failed unit, I noted only a 2C rise on the mounting stud, with no heatsinking, when the unit failed. On my second go round, I mounted a large heatsink directly to the base of the unit, and detected no temp rise, even after my let the smoke out event occurred. I did notice that as long as I kept the duty cycle very, very low. Like well under 1%, the unit did last longer- But that 30 seconds of rumbling aircraft carrier I so enjoy, kills these things every time. On the plus side: These devices have the highest shaking efficiency of any sensors I''''ve tried ie less power applied vs. shaking force, and also they have by far, the widest frequency range of a tactile feedback sensor in this case I was able to reproduce, instrumented, 10K, which is astonishing. I suspect if I had derated this sensor to say, 10-20 W max applied power, then it would have been ideal for my application. In order to do that though, I would have to buy four devices, to actually get the shake capacity advertised for one device. That would make this by far, the least dollar effective solution available on the market. My 2 cents, your mileage may vary.