Belden wire from Blue Jeans Cable?

Bill..14 awg is just fine for 15 foot lengths. I use 16 gauge for the same length. I know of others that use 24 awg. The sound you get at the end really depends on how well your amplifier handles the load. Some like heavier gauges..it's more of a preference than wrong or right.

I find the smaller solid core gauges to have a much cleaner tighter sound over the the larger stranded gauges. Which too my ears roll off the highs and make the music sound fat and indistinct.

Here's a DIY Wire Gauge Calculator. You need Excel to run it. It also has a Damping Factor and SPL Loss Calculator included. You could actually use two different type gauges in each run. Make the negative side or return path slightly larger and tweak the sound.I could be wrong, but from what I've read and heard the dampening factor will change the sound of the speaker. Probably more than you wanted to know.LOL

Good luck

Honestly, I have many of the bluejeans running component video, Digital audio Runs etc... The Video side with the belden brilliance is about as good as you can get for any cost.. However I have heard bigger differences switching out digital links for the audio side, the bluejean is a little dry and restricted, Bolder cables with eichmans, and Cardas, Wireworld variations I use now easily show much more sonic impact, better bass, less grain etc... They are just more musical, but again for like 15 bucks a meter charged by bluejean cant go wrong, but for 80 to 150 bucks a meter from others I have had better audio results, and they are almost night and day difference.. Maybe the bluejeans don't have color at all, and that is just the way a straight signal sounds, but again I like the added effect of texture and depth other cables Add, if that is wrong then so be it, to me the end Tone is the most important.