Ok here is my setup:
Factory HU ran to a Audio Control LC2I Line output converter.
LOC to 2 channel amp for doors and a seperate 2 channel bridged to my sub.
Per the instructions that came with the LOC I should set the volume of the HU 3/4 of the way up and slowly turn the gain knobs on the LOC (one for full range and one for bass output) until the maximized light starts blinking. I am assuming this means the signal is clipping. I did that but when I go to set the gains on my amps they basically have to be all the way down in order to not distort the speakers. They sound good now but I can hear a small hiss and I am sure the levels are not set correctly. I know the purpose of the gain knobs is to try to "match" the output of the radio to the amp or something like that but if someone could give me some pointers I would appreciate it.
Also this LOC has the Accubass feature which is supposed to correct the factory bass rolloff of the HU but I didn't really notice any so I left it off.