why do u say "signal lost" ??

the passive are there to attenuate <generally...the tweets> and help fix the usual spike between the slopes...
there is no signal lost

imo...an active xover is better than having ur "typical" amps internal xover doing the work...
most amps internal xover arent accurate anyway..

4thgenhatch...
the lanzar xover u have above looks ok...
keep in mind that its only has a 12db/octave slope though..
u might want a third order slope for the higher frequencies...
wiring difficulty might b another reason u wont like that xover...
if u have 3 long rcas going back toward the trunk....its gonna b costly and messy...

imo...get one of those square xover and mount it in the trunk...
one rca to it and 3 shorter rcas going to ur amps..
my friend has the lanzar x6 and it has 18db/oct slope as well...
so u might wanna look into that instead