OK, so when you bi-amp (which is what you need to do in our set-up) the Front 1 are the front door mids/highs and the Front 2 are the underseats. The lowest possible HPF for the Front 1s is 200Hz. This means you need to "meet" the door mids/highs with a matching 200Hz LPF on the underseats. You cannot play the door speakers lower than 200Hz.
Mobridge DA2 > JBL MS-8 > JL Audio HD600/4 > (3) Hybrid Audio L3SE & (2) Rainbow Cal25; JL Audio HD900/5 > (2) Morel HCW-10 & (1) AE SBP15