How could i wire an amplifier into a factory head unit, while having it wired to use the factory wires to play front door, and rear speakers? I have a 2010 honda accord lx.

rockford 6.5 component set front door upgrade
rockford 6.5 component set rear upgrade
rockford r250-1d amp

Help! thxs

 

crutchfield.com will see you all the connectors to make what you are trying to do work.
if you buy the amp from them I believe they will give you all / most of the connectors for free.

 

Buy both Metra wire harness adapters, into car and into radio. Gives you access to all wires with no cutting and industry standard colors