I.e. Switch the highpass a bit up and a lpf on a driver down a bit. So that 10 to 20 hz between two drivers becomes common. Whilst the polarity is inverted, you can increment the time delay till you feel the midbass is at its weakest. Flip the polarity back and you are done. But for alligning all the drivers, the process is to and fro, side by side till the last driver which is tweeter.
That is in terms of DTC.
Otherwise it is straight forward that adjust the HPF where you feel there is no distortion in the driver and it can easily handle this frequency. But technically, you should limit the HPF/ Slope by taking the (Fs) into consideration.