Kurt:
You need to notch your Reference Spectra.
Actually, if you have a good controller, then the Drive should automatically dip so as not to create any spike at 1.97 Khz.
But since controller limit (Dynamic Range ) may have reached, now you can bring the reference spectra ABOUT 1.97 Khz down by say, 20 dB.
Please tell if this works out.
All the best !
Deepak Jariwala
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