A series notch filter can be used to control the impedance peak present at the
resonant frequency (ss) of a speaker.
The series notch filter is most useful when the crossover frequency in a highpass filter is near the driver resonance.
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Dickason suggest you can try increasing Rc in increments of 0.5 Ohm at each time until you reach your goal.
Vance Dickason, "The Loadspeaker Design Cookbook"
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Series Notch Filter Designer