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Electrical code probably wouldn't permit bare cable in the slab. You would need conduit and it should probably run under the slab and not in it. It might then require a different type of insulator on the wire as well which could get expensive. As with any hole in a slab it would also introduce a weak point.

Conduit can be nice and running it under the slab, or subfloor can save money as the wire can take the shortest path from the breaker box to the area. You can also save a few feet of speaker wire going under the floor as opposed to around the walls. Running 1/2" conduit though a 2x4 frame is a pain too, with lots of drilling. If it's under the slab though you'll have to be pretty exact about where you want it and there won't be any room for modification in the future.
 
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