In-Wall speaker wire question...

[DeadDog]

I want to run this cable to my back wall and then up through the wall to hook up my surround speakers. The wire will be running along the baseboard to the back wall then run behind the drywall to opposite ends of the couch (see gallery).

Here's the wire I want to use:
http://www.monoprice.com/products/pr...seq=1&format=2

I want to use this as it contains all 4 wires I need to hook up my two surrounds and is easier to hide 1 wire along the baseboard as opposed to 2. My question is, does the outer white sleeve need to be on when I run the wire through the wall? My plan is to seperate the wires once its behind the couch and just run two wires (red & green, blue & black) on each side in the wall behind the couch.

Hopefully that makes sense. Is it safe to run it that way or does the outer white sleeve need to be on when it runs behind the wall? Thanks.

BTW: I'll be getting new surrounds before I do this