In terms a ordinary Joe can understand, what's the differences in speaker cables vs. guitar cables? For instances, I know it's bad to use guitar cables on PA speakers, mixing board, etc. Why?? Also, use a speaker cable between a head and cabinet, right? Not a guitar cable? But you use guitar cables between pedals, but once it gets to the head, then you go to speaker cables...... Just give me a generic explaination........thanks so much for feeding the numbskull.