As I dont have the manual for the 8454, I am trying to figure the best way to go active. It is my understanding that neither offer bandpass so I have to figure a way to make it work. I am thinking of using the highpass crossover on the channes 1 and 2 from the amp for the active tweeter. What would be the easiest way to make a bandpass for channels 3 and 4 between my amps xovers and the xovers in my 8454 assuming neither allows bandpass? I use an older Alpine 5 1/4 type x set. Is it best to stay with crossover points in the passive set and work from there?