Amplitude:
This is the excursion by the plate on one fully cycle.

If two plates are vibrating at the same frequency, a larger amplitude will produce more force on the body. For muscle building, this can be advantageous, but for general well being, too much amplitude can overload the body and push it into a state many users know it as "sympathetic stress". This is the fight-or-flight response that shifts the body to survival, away from maintenance and healing.

Amplitude cannot be considered separate from frequencies. The actual power from movement to lift someone is actually force given off by the plate, not amplitude or frequency.

The following equation describes force vs frequency: F=mRf2. (I had to get an engineer to help me understand all of this. I am very surprised the people who are actually importing these machines didn't do all these things I am doing).

This equation says that force (at a given amplitude) depends on the square of the frequency. In other words, for the same amplitude, the force at 20Hz is four times as much as at 10Hz. (not double as people might think).

Viewed differently, it means that to produce 1 G force at 3Hz it requires 100 times that amplitude required to produce 1 G force at 30Hz.

Practically speaking, this means that many models have a useful range of frequency that is much narrower than the absolute specification because at the low end the force is too weak to have meaningful effect, and at the high end it is too powerful and jarring to endure.

Bottom line: Greater amplitude is better, but only with the ability to control it, and only if you need it (it comes at a cost).
In contrast to the peak velocity amplitude, the root-mean-square velocity amplitude of a vibrating machine tells us the vibration energy in the machine. The higher the vibration energy, the higher the root-mean-square velocity amplitude.

The term ‘root-mean-square' is often shortened to ‘rms'. It is useful to remember that the rms amplitude is always lower than the peak amplitude.

Remember, when choosing a machine with higher amplitude the more the up and down displacement the more stress that is applied on the machine. To make the machine less prone, solid steel can help lower the stress to the machine. The heavier gauge the frame, the less stress fractures. If using a plastic frame, make sure it is hard, ABS plastic or strong plastic that doesn't leach smells when it gets warm.

Amplitude on longer plates VS AMPLITUDE on shorter plates:
You can get an amplitude of 10 mm on a 20 inch pivotal plate a well as 10 mm of amplitude on a 27 inch plate. A shorter plate will definitely have a different feel to the ankles than a longer plate. With a longer plate, standing at the tippy edge will get you 10 mm without pivoting as much. If a plate was 60 inches, for example, the plate wouldn't have to pivot hardly at all to give 10 mm. A longer plate will always feel smoother if you are trying to get to the low hertz at high amplitudes.

In order to get 10 mm of amplitude on a 20 inch plate at 6 hertz, the plate has to pivot at a larger angle than a longer plate has to. This is particularly important to those that want to vibrate at the lower speeds. At high speeds, for those wanting high G forces, it is not a much of a concern and this is why shorter plates rarely get returned. If buying for purposes that the plates that give low hertz (6 and under) and you want high amplitudes to flush, then this is when it is important to most people.
 Horsepower Amplitude Wattage Frequencies Amperage Plate Size

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