factory head unit and amp hook up

[mechanic021]

When hooking up an aftermarket amp to a factory radio is it best to use a line out converter or use the high level inputs that hook directly to the car speakers from the amp?

 

[conig]

if you have an amp that can use speaker wires for input that would be the easiest way. or you could use a converter.

now if only we knew whihc wires to use. I have almost the same post just below yours. hopefully someone will tell us.