If someone had a Bose speaker setup, I'll be highly suspect of the wiring used.
You should verify that it is, at minimum, 14 gauge in-wall certified wire. Your home insurance may not cover a fire caused by a short in them, assuming they are not up to snuff.
Worst case scenario, you might have to bury the existing wire runs and start over. Hopefully, if it comes to that, you can use them to pull through better suited speaker wire.