The Controlled that came with the woofer array had three stages of equalization. Stage one was a 6dB/octave low pass network that compensated for the normal roll off due to open back dipole cancellation. That equalization needs to be correct from 25Hz to 1kHz. The next stage was an 18db/octave high pass filter at 25Hz. As an option, this could be higher order than 18db/octave but NOT less than 18db/octave. The last stage is the crossover from the subwoofer to whatever full range speakers you are using. The crossover in the Controller had matching high and low pass filters at 100Hz and were also 18db/octave. All filters were maximally flat (Butterworth) types.
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