The difference is resistance is actually trivial. Remember that resistance faced by your amp includes both the cable and the speaker. So if you're using 12 AWG cable, the difference in resistance between a 2-foot length (0.0034 ohms) and a 10-foot length (0.0170 ohms) doesn't matter a whole lot to an amp driving a speaker whose resistance starts at, maybe, 3 ohms and goes up from there.
Unequal cable lengths for home theater????
I have 7 speakers and a sub in my theater. Each pair of speakers has an equal length pair of speaker cables. I was re-doing some other wires, and I noticed that I could really clean up the rat's nest behind the big-screen TV if I didn't have to worry about equal speaker cable lengths. All of my cables in the theater are home made Canary cable and WBT connectors, so I can easily make changes. Will I be sorry if I do this?????