i do know that the amp is for the 2 6x8 subs... so im 99% positive it is no different than the 6 disc system (the head unit doesnt put out for the two subs, the amp provides that). That being said if your upgrading your doors, you should always run your upgrade speakers form an amp anyways, not the head unit. Any head unit just doesnt put out enough, especially with components. It sounds way better too 
But that doesnt really answer your question lol... sorry.
But that doesnt really answer your question lol... sorry.