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 > ARC XDi 600/4 > JBL Gti 408 Mids & Vifa OT19 Tweeters; PG Ti2 1600.5 > Morel HCW-10 & IDMax 15