Give me a full range signal!
You can add aftermarket power to your factory audio system using AudioControl's Line Output Converters.  In this instance, the summing capabilities of the LC8 (both internal and external) allow for aftermarket amplifiers to power front and rear speakers. 

Full range signals put you in charge
In factory systems with complex internal crossovers, AudioControl Line Output Converters with internal summing can provide you a full-range signal to power aftermarket amplifiers.  And once you have full range pre-amp signals from the LC6i, your system design possibilities are endless...