right now its setup like this.
The HU has the rear/sub out option where it can change between the two. Its set to sub out and my sub amp is using that pre out. that leaves the front preout which my 4chan amp is Y'd off of that preout.
i already have the dedicated sub out but only one. Could i Y off that and put in another mono amp like i already have? These amps cant be chained together. So looking at what you said im running option one but the amps only have rca inputs no outs. Thats where im confused on what to do. Would i switch to option 2 then? And if i do switch to option 2, that means i have enough preouts for the 4chan and 2 sub amps right? i miss having my fade and balance adjustments :P