It shouldn't be running as hot as you are making it seem. The amp is supposed to be in a ventilated area, instead of under a seat or something. The wire says gauge 4 or the amp says gauge 4? You can test the gauge of the wire with some wire cutters. All of your other wires wouldn't have an...
You have to download the correct codecs to play the file. I've forgotten the site, sorry. Just right click the file and select open with Windows Media Center and click the website that it should send you to.