I need to make some speaker cables for a friends bar. 2 mains 2 subs . Need cables for them. He asked if its possible to use electric wire cause he has some. I instantly said no cant do that, but really couldn't explain why, and I got wondering if it actually does matter that much. What would be the major downsides to using thick gauge electric cord. Say a commercial appliance cord or a heavy duty extension cord? I have a basic understanding of cables but always just bought the proper cables and never put much thought into it. Any insight on the downsides if there is any. Obviously the advantage is we have connectors/ends already so it would be cheap to do. Cheers guys