For isulated walls you can rent (OR BUY) a device called of all things "a fish". All it is a stiff wire on a spool that can be feed out or retracted. If you have an unfinished basement you can do what I did; From the basement drill a 1/2 inch or 5/8 hole up through the flooring material, through the bottom plate of wall framing and into the cavity between the appropriate wall studs. Make a small hole where you want the speaker wire to come out. With a friend at the speaker hole work from the basement with the fish until your friend can grab it in their fingers. (This can be frustrating, but keep trying) then pull a sting through with the fish and use the string to pull the wire.
This makes for a very clean installation
