Piggybacking a powered sub off the factory sub

[kenwortht800]

Hey guys, new to forum.

I am wondering exactly how I piggyback the audio signal for my powered sub off of the factory 8 inch.

[..::ryan::..]

You can always get a Line-out converter

[kenwortht800]

Could I just grab the signal off of the factory wires?

[..::ryan::..]

You could do it off a door speaker if you wanted to.

[..::ryan::..]

If you can find a wiring diagram I'm sure you could just tap off the L (+)(-) and R (+)(-) going to the factory amp. Personally I think the LOC would be easier.

[kenwortht800]

Thanks,

Where would I start looking for the factory amp?

[..::ryan::..]

In most cars it is under the passenger seat. Not sure about the Super Duty's since I don't have a factory sub. Maybe someone can chime it that does know.