You will need an Audio Control LC2i (LOC) to tap into your existing setup. Two ways to connect it. If you have a sub channel then you tap that and feed it into the left input on the LC2i. If you don't have a sub then you tap into the 2 rear speakers and feed that into the L/R inputs on the LC2i. It pulls off the bass signals, cleans it up and provides a boost and optional bass level control knob.
This is THE best way to add subs to an existing factory system.

 

I do already have a line out converter since I originally had the amp tapped into the rear speakers before I had upgraded to an aftermarket head unit in the magnum. My challenger doesn't have a factory sub, but was hoping since it was an available option that the cabling would already be there to tap into that instead.

 

Sorry but you kind of lost me there.

Are you saying that you have an amp that accepts speaker level inputs?

If you are using the factory Challenger radio and want to add bass then you really should use the LC2i. Any speaker level inputs on an amplifier will not give very good results. Also any line output converter besides the LC2i will not be made to give the same results you get using a quaility LOC like the LC2i. That's why it costs around $100 vs $20 for a cheap LOC or worse yet using the built in LOC in an aftermarket amp. It is simply THE best way to add bass to an existing system and do it right. Other approaches will give you mediocre results.

 

No, the amp doesn't accept speaker level inputs, I have a separate line out converter. It's not that specific one but I've used it before and it worked great and sounded just as good with that as it did when I had swapped the factory stereo for an aftermarket with line outs and went straight from the headunit to the amp, so I see no reason to upgrade to such an expensive different one.

Mainly I just wanted to find out if their was an existing line level output for the factory sub or if I would have to use the LOC I have.

 

Check out PAC Audio. They have OEM specific line output converters. No cutting or splicing of wires required. Not sure if they have one for your make and model but I've used them in 3 or 4 cars and they are plug and play.

 

bump.

How did you wire in the sub?