Thank you guys for your responses. I am embarrassed to admit that I created a problem where one does not actually exist. After I created this thread an astounding revelation came to me (duh!). Just disable the low pass filter in the preamp, run the full audio signal to the subs and use the low pass filters in the subs. I can still use the preamp's high pass filter to keep the frequencies below 50hz out of my mains. I wish the filters in my preamp were 24 db/octave instead of 12 db/octave slope. It seems that a steeper roll off would make for better integration.
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.