We will analyse this graph together with you because it perfectly shows the difference between a mechanic suspension (purple) and our electromagnetic suspension (red) :

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We first study non-linear behaviour (distortion)

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In this graph you clearly see the non-linearity of the mechanical suspension (the purple line). The more the cone moves (x-axis) the more energy (ampères, y-axis) it relatively requires to be moved equally further.

Our EM (electro magnetic) suspension (red) is perfectly linear. Each millimeter of movement requires an exact equal increase in current. 

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Maybe an example by numbers will explain it more clearly :

If you reed the purple curve (for mechanical suspension) you'll see that 1mm of movement equals approximately 0,2A of current.

If a driver was linear you should expect that for 2mm of movement 0,4A (2 times 0,2) is required, right?

But look at the graph. It shows that for 2mm of movement you need almost 0,6A of current. Talking about a non-linearity here!

 

Now we explain why this is so bad.

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In reality if the music signal is twice as strong your amplifier will send 0,4A instead of 0,2A. So you should expect the cone to move twice as far (and generate a sine wave twice as big). But it doesn't. Because looking at the graph it will move only about 1,6mm instead of 2mm. Thus creating a smaller sine wave than what's on the recording. This is what is called "compression". The cone can't move freely and is restrained by the mechanical suspension of spider and surround. The louder you play or the stronger the dynamics in the music get, the worser the effect gets. 

This is why the dynamic response of our driver is so much better than the one of classic drivers, no matter how good they are. Our LEMS driver has no compression at all because it's more than 99% linear.

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Now we study energy absorbtion (or loss of detail)

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If you look carefully at the graph you'll see that the lowest point of the purple line doesn't touch the "0"-point on the x-axis. This means if you put a very small signal (micro detail) of energy in the driver it doesn't move at all. Otherwise stated : your detail (small signal) is lost.

 

Once again we will show it with an example by numbers.

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Check on the graph below what would happen if we put 0,05A of current in the driver?

Right, the cone moves 0,00mm! Yes, you are right. This small signal (let's call it detail) is completely absorbed by the mechanical suspension! 

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The same happens at larger excursions of the cone. Spider and surround will absorb more and more energy as they are pulling harder and harder to get the cone back on it's "0"-point. That's because the excursion is stretching the spider and surround more and more. This is also the compression explained before. With normal speakers this is what audiophiles often describe as "the detail is pushed away to the background" by the lower frequency's.​​​​