So i am going to take the input for the front low speakers from the factory amp to my new amp for my subs. My question is, how do i exactly wire it so...my front low speakers i took the input from are getting sound too?

So all in all, all speakers are getting sound, but i am getting the input for my new amp....from the inputs of the front low speakers.

 

If you have harman kardon, you should take the feeds from the rear speakers, not those in the door.

Honestly, it's much easier to take the feeds from the rear speakers, anyway! Unless you're installing the subs in the doors

 

use the rear speakers. i have done this. alot less running wires!