active filter from rod elliot and sub filter questions

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just got the project 9, 2/3 way active filter from rod elliott and its look nice..
now i want to here can i do something with the lower frequence in a 3 way filter like on i plate amp made for an sub..

i was thinking of boost phase and so on..

there is the Project 84 - Eight Band Subwoofer Equaliser from elliott but im not sure how it works..
should it just be connected on the output of the low frequence out and then to the amp??
 
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