kitch29 is exactly right. The mortise behind the molding is not only the easiest solution but since it is only behind the moulding it remains accessable if you need to add/change wire out. You may need to go to a little taller moulding then before. If you are worried about nail protection then run 3/4"EMT conduit in the dado and pull the wire through it. This is a common problem found on most older homes or homes without access to the attic.
Surround Speaker wire Recs - WAF need
I have gone home theater route in my old (60 year) house. We are having remodeling done and my installer tells me the only viable place is along the baseboards. I need a good and fast recommendation for this. The wire needs to be unobtrusive. Have three runs of about 45 feet Thanks. Richard