If the socket and it's feed wire are both on the other side of the stud you'll be fine.
If not, keep the speaker wires on the opposite side of the stud cavity. That will give you almost 16" of separation.
Drill a hole in the top plate, and test for fire block with a snake; maybe you don't have it.
Put a piece of tape on the snake, at a certain distance; (i.e 8 ft) if you go past that mark, you don't have blocking.
It also helps as a gauge as to how much snake you've fed into the wall.