Involuntary and voluntary
Introduction and description
A tactile transducer or "bass shaker" is a device which is made on the principle that low bass frequencies can be felt as well as heard. A shaker transmits low-frequency vibrations into various surfaces so that they can be felt by people. This is called tactile sound.
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.
Tactile transducers may be used in a home theater, a commercial movie theater, or for special effects in an arcade game, amusement park ride or other application. So you may be experiencing the effects of these without realising that they are the cause.
And they have caused spiritual experiences, auditary hallucinations being, from the evidence, the most frequent.
Here are some example descriptions of the products
Earthquake's Quake 10.0 Is a Special Sub harmonic Bass Shaker
Unparalleled Tactile Performance in Your Home, Car, or Elsewhere
The Quake 10.0 is an awe-inspiring sub harmonics unit designed for special-effects enhancement. You can now add super-sensitive low-frequency effects without using costly hydraulics or a bulky and expensive subwoofer.
You can control sound- pressure levels throughout your home, car, attraction or venue by effectively isolating the low end to your seats and flooring. The Quake 10.0 virtually eliminates low-end resonating into adjoining areas.
Designed for superior music quality, the Quake 10.0 answers the need for both accurate low-frequency response and maximum tactile effect. Music has never been more powerful and affecting.
Insane Power to Shake You to Your Senses
One Quake 10.0 bass shaker can easily replace three, four, or even five typical shakers. Quake 10.0 can move two or three theater seats or even a sizeable platform.
Quake 10.0s are maintenance free and almost indestructible.
With only one moving part, and a cast-aluminum heat-sink for excellent heat dissipation and protection from damage, the Quake 10.0 is the only shaker you'll ever need.
Universal Mounting Option
5-40 Hz Frequency Response
Less Than 7-inches Long and Less Than 4-inches Tall
2-Ohm Military Grade, Flat Wire Aluminum Voice Coil
Cast Aluminum Heat Sink
Today’s movie soundtracks, especially the action and sci-fi movies that we home theater buffs just can’t get enough of, often have very wide dynamic range with powerful, hard-hitting bass. The physical sensation of that bass, the thump you feel in your gut during a big explosion, is a key part of what makes the experience so compelling. In the quest to reproduce this, many HT owners add more and bigger subwoofers to their equipment chains, much to the consternation of their spouses and neighbors (and to the detriment of their wallets). What many people don’t realize, or may mistakenly dismiss due to misunderstanding of the purpose, is the benefit of adding a tactile transducer (aka a bass shaker) to a seat. This is a relatively simple and inexpensive tweak that can enhance the bass impact of a movie soundtrack without actually adding more bass.
There’s a common misconception that tactile transducers are a gimmick that will jostle your chair around violently like a theme park ride. That’s only the case if you set them up and use them incorrectly. (If you want the theme park experience, get D-Box. But that’s a completely separate topic.) We’ll talk about how much bass shaking is too much in a moment…..
………When turned on, the shaker will vibrate whenever there’s bass activity in the subwoofer channel. The deeper and louder the bass, the more it shakes.
Of course, you’ll need to attach the shaker to your chair. …. Exactly how you do this will depend on the specifics of your furniture. In some cases, you may be able to attach the shaker right to the seat itself. If not, what worked for me was to screw the shaker to a small particleboard plank, and then screw that to the support beams of my chair.
The amp “Volume” should not be set very high. Your first instinct may be to crank up the setting to get some good shaking action. After all, you’ve just done all this work to attach the thing to your chair. Don’t you deserve the satisfaction of knowing that it’s working really hard? While that might be fun for the first couple of movies, it gets old really quickly.
The bass shakers are meant to supplement a subwoofer, not replace it. Properly implemented, the bass shaker effect should be so subtle that you don’t even consciously notice that it’s working. A bass shaker should enhance the physical sensation of good bass by adding a slight, non-directional vibration that corresponds with low-end activity in a movie soundtrack. If you can tell where the shaking is located, you’ve done it wrong. Turn down the amp volume a little bit at a time, and experiment until you find the right balance.
If it works, you shouldn’t need as much loud bass to get the same sense of satisfaction from high-impact movie soundtracks. I find that this is quite helpful in an apartment. And it wasn’t particularly difficult or expensive to implement.
Personally I prefer a spin dryer, but then that's me ................
How it works
Stimulation via resonance - high intensity.
They may have also caused illness given the resonance is indiscriminate but this I have been unable to find out.
Out of time
- The OBE case histories of Dr John Palmer at John F Kennedy University – 02 Using vibrating chairs 023117