Filter Slope Question

My Emotiva preamp has bass management features that incorporate a 12db/octave slope for both the high and low pass filters.  I like using this feature to keep the low bass out of my main speakers.  I am going to purchase two Rythmik F12 subwoofers but the plate amps in these subwoofers do not have an option to switch the built in filter out of the circuit.  It has both 12db and 24db slope options.  What would be the result of having both the preamp and plate amp filters in the circuit?  What would be the result if I used the 24db option on the plate amp along with the 12db filter in the preamp?  Will a 12db high pass filter and a 24db low pass filter impede proper integration?  I plan on crossing the mains over to the subs at 50HZ.