Parallel notch filter for Peerless 830869

Passive parallel notch doesn't seem to be doing the trick for me. Did you use a library block? When I try to either tune it or optimize it, it doesn't seem to do what I want to bring the peak down.
Playing around with it a bit more, the parallel notch filter does seem to provide an impedance peak at the desired frequency, but I can't seem to get any more than about 3-4 dB reduction.
 
What order of slope are you planning to use and at what crossover frequency? You might not even be able to hear that peak anymore depending on the net attenuation by that point, plus with the other driver taking over.
 

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