active crossover, independence of filter points

re active crossovers ( such as dbx DriveRack PA+)

Can the low-output’s filter frequency point be set independent from the mid-output’s low bandpass level output point? i.e. such as:

high-out highpass filter at 850hz
mid-out mid bandpass 850hz top and 60hz low end
low-out either full frequency (with a sub that has its own variable filter), or say 80Hz / independent from the 60hz of the mid bandpass

>the basic idea is to let the midbass roll down and off yet provide protection at/below port tuning, and employ a sub for support of the low frequencies, and eq'ed where necessary for a smooth(er) frequency through the transition between sub and midbass rolloff.

thanks in advance for your comments - first can they be set independently, and second if you have experience with this questioned set up