When wiring speakers is it bad to use thicker wires out of a stereo, then using thin wire to reach the speaker?

-My house is already wired for surround sound speakers but the speakers I recently got (for free, I would not have picked these) have hardwired (idk a better word) wires and therefore no input for my speaker wire. Instead of having to rewire my living room I was going to use the thicker wire out of the stereo and attach the thinner speaker wire to it in the middle. Is this bad or dangerous in any way? And does it affect sound quality?

The thick wire is not that much thicker maybe 3/2 the size of the thin.



STEREO ====thick====> -----thin-----> SPEAKERNo it's not dangerous - as in causing a fire - to do that. Thicker wire is better particularly for long runs. However with the quality of speaker that has the wire directly attached to it, you won't notice any difference with better wire. Just make sure that you make the splices nice and tight and tape them up well.
You should have no problems at all using the thicker gauge wire from your stereo and then going thinner. Hope this will help you out.