I have dell laptop and I want to have more sound added to make it a bit louder. I was wondering if you add life a sub woofer and speakers like you can do with a PC.. I don't want to add anything to the card I would like if possible to add something external..

Any Ideas??

You should have a line out that you could connect devices to

There is software you can add also to boost audio

A good one that adds a lot to to basic sound out would be
SRS Audio Sandbox
SRS Audio Sandbox download and review - enhance speaker sound quality from SnapFiles

I personally use this for XP and Vista and makes a difference

As far as line out, put your line out to external speakers or however you would like to try it out and see what works best

But to answer the question directly, Line Out from your laptop