Speaker cable length

@oldhvymech. Interesting. I thought that signal amplitude is much lower across speaker wires than across interconnects. and thus you would get less of an LRC loss. But hey, as you say, maybe I've been wrong all this time. Wouldn't be the first time that's happened. 

12g zip cord works fine and different lengths do not matter. These guys can spend a ton of your money for little to no, mostly no, gain. I run bigger wire than really needed but there are times I am working on 200 to 600 seat theater speakers and if the customer wants them cranked up I do so. Yes these are high fidelity speakers and poor components would be noticeable.

simao;
With the lengths you mentioned, audiophool BS aside, two different lengths will make no difference that any human ear can discern. The only real consideration is the gauge you use as it has more of an effect on the sound than length does. From my personal experience, 10 gauge tends to favor bass at the expense of highs, and 14-16 tends to be brighter. I have always had the best results using 12 to 14 gauge wire. If you are into making your own cables, check out http://www.knukonceptz.com/. They sell quality wire and connection accessories at realistic prices.

OP you can setup a simple experiment as I did years ago to determine the effect of speaker wires. Get a simple analog toggle switch and two sets of wire to compare. Have someone else switch back and forth without you knowing which cable is being used. A blind A/B test with instantaneous change from one to the other. It doesn't get any better than that. Everything else is just hearsay. I did this hundreds of times on Apogee Diva's and Klipschorn's along with other curious golden ears. We all came to the same conclusion.

There are a lot of other audio set-up aspects far more relevant than fretting over unequal speaker wire lengths. I saved considerable money on my 12ft/20 ft pair.