PAC line output convertor
You could also use a regular old line level converter off of these wires should you need to step them down, again off of the same place. There is no need to a PAC unit or to run RCA's all the way back if you're still using the monsoon head unit.
It is only worth running RCA's if you use an aftermarket deck, which is highly recommened. The monsoon deck puts out a lot of distortion even at 50% volume.
If you're just adding subs, then it should be reasonably ok.


