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one of two standard ways should work. cut hole for old work box, drill hole from underneath, into the wall cavity from crawl, then either:
1. push fish down through hole into crawl, tape the wire to it and pull it back up,
2. If 1. doesn't work, then you might tape wire to fish in crawl and push up into wall cavity. They you use another fish or coathanger with a hook bent in end of it to grab the fish through your cutout and pull it into room.
Remember, you really should be using "in-wall" speaker wire. Regular stuff is not fire rated or approved for in-wall use. this holds true for any wires you put in-wall, including network wiring.
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