speaker wiring 08 SX4

[hards]

Hey there, so I picked up the AWD JL model that comes with the 4 speaker single CD system, and now I am considering installing the other 4 speakers and possible the woofer.

Question is, I am assuming that the speaker wiring for the small (1 inch tweeters I think) on the doors are already there and running to the head unit. So is it that simple to just add the other 4 speakers?

Also where the heck would you put the woofer, I mean its a small car and I am somewhat puzzled and is the wiring already there as well?

Has anyone done this?

Thanks

[grats]

I have the JLX model with 8 speakers and the sub woofer, the sub woofer is located under the drivers seat.

[gio]

The Trunk space huge. Use it.