I was going to recommend some Tributaries flat speaker wire, but it appears that they have discontinued the two types I was familiar with. They only carry a silver plated OF 14 awg flat type now (403 strand version). It runs about $2.50 a ft., so not cheap, but probably pretty good, and will experience very little loss over a long run. Only downside, if not running it under carpet, or through walls, is that it now uses a clear jacket, which might not be as attractive as their discontinued white jacket models. I'm using their old plain copper stuff, lol, that was maybe a wee bit cheaper, but which I love. Now that I know it is no longer made I'll have to really take care of it.