I search a bit but didnt' find the answer so i wanted to ask...

I have the Navi.. so if i wanted to get an after market system.. how does it work? will i still be able to control the sub and sound system from my dvd? and i keep hearing the stock amp.. where is it located? or is it a build in with head unit?

i installed sound system before in my ek9, but i wondering is it different now since the stock amp is there too?

not quite sure.. how to paint the pic. but maybe some one can give me an explaination... thanks

or any input in as far as aftermarket sound system...

 

I just put a sub in my fa5 with navi and all you need to do it remove factory sub, tap into the factory sub wiring with your high to low adapter, you can then control the sub level from the factory unit. Run ur power and remote turn on up front and make sure you catch the factory amp turn on for your aftermarket amp, power wire through to battery..rca's from amp to hi-lo and voila!