If you really watched this whole video
completely, I have a tip for you:
get a life! ;)
The yellow curve was
the earlier measurement, when the driver was lying underneath the table.
Therefore you can see a resonance here,
which indeed under the top surface...
was reflected from the top surface.
At the green one we also have a small resonance here.
This time
it is smaller because the driver is placed vertically
but also that might be the
reflection from the floor.
Over here
these three resonances are really caused by the mechanics of the driver.
This first one is probably
caused by
the foam surround.
Foam surrounds generally cause less mechanical loss
Therefore this resonance is not very
strong. The other ones
might be resonances of the membrane.
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