I just finished installing my P4300DVD HU and need a little help with setup. Does this unit have seperate crossover capability per output channel?

I am running my sub and front components off dedicated amps both with built in crossovers, but my rear speakers are running straight off the HU. I need to set high pass filter on them but can't seem to find per channel crossover on the menus.

Does it exist?

I have not seen a per-channel crossover, but I have used the high-pass filter which I believe is dedicated to only the front and rear outputs. You will probably have to set the filter on the HU and adjust the crossover for your front's seperately.