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"Noise" in Frequency Domaine

Hello,

 

I am taking the impedance of a dynamic driver and when I am using LabVIEW to take the data and use MATLAB to plot I get the image the jpg below.

 

Does anyone know what might be causing this noise?

 

Thank you

 

 

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How does the data look like in LabVIEW?

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It looks the same if I use the mag and phase FRF function as well.

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Are you sure it's noise?

 

If it's a dynamic driver headphone could it be it's natural frequency? No expert, but from Wikipedia:

 

Natural frequency is the frequency at which a system tends to oscillate in the absence of any driving or damping force.

 

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