Can someone tell me if there is really a difference in speaker wire from one manufacturer and another? A 100' roll of in wall speaker wire (UL3 rated) from Monster Cable or Audio Quest runs about 85 to 100 dollars. Monoprice.com has the same length and type of wire, although its UL2 rated, for about $20. I work for a cable company, I won't say which one for fear of insult hurling or other such potential behavior, and while I won't say Monster Cable is a bad product, because its not, it is way overpriced. So aside from the UL2 or 3 rating, isn't copper wire just copper wire? There really is no shielding other than if its wound. Maybe that's the difference. Any advise would be appreciated. Thanks in advance.