The Posts that I have read recommend that a person go to home depot and purchase #12 speaker wire. It appears to me that they have two different quality wires for sale. Our Home Depot does not have #12 in 100 ft rolls. They do have #12 in 250 ft rolls and also by the ft. at 34 cents/ft/. The same grade of #14 wire is 28 cents/ft. While their RCA #14 wire is $35 in a 100 ft roll. Usually the per ft price is more than a per roll price yet the RCA in a roll is at a 25 percent premium. This makes me wonder if it is superior in some way such as shielding. They also talk about low oxygen copper. Or is the premium just for the RCA name? My longest run is about 40 ft. Should I go with the #12 or the #14. If #14 in the roll or by the foot?