Thank you for your guys input!
Couple comments though. Ya, the system that he is installing isnt the best & he is going for the cheapest route possible, like many of us do. We try to find the cheapest price for everything we buy (comparison shopping). Not a big deal.
But, the welder power cable I saw was not at all the same as car audio power cable. It had 3 separate cables inside the plastic with larger strands then normal in each cable.
Either way, shouldn't you use car audio power cable for an install (the right tool for the job) instead of welder power cable (the wrong tool for the job)? Maybe this is just an opinion? Because I don't believe that "wire is wire," Moderator. Let me show you a picture. These two wires are both 4 gauge. The one on the right is a respectable brand name 4 gauge and the one on the left is some cheap crap. I took this picture to show people to be careful of what they buy. Yes, if you size your wire correctly then you will be ok, but shouldn't you stay within the same category of wire? I could buy 0/1 gauge of the stuff on the left and it would be the same as the stuff on the right.....
