Zub, as Curtis said, forget about equal length. That's just another bit of audio nonsense that seems to float around(thankfully very little of it on this board). The signals travel along the wire at around 80% of the speed of light(which is about 186,000 miles per second)and the wires would have to differ in length by miles before there would be a significant difference in timing. A shorter difference would make one speaker louder than the other because of less power loss in the shorter wire, but this could be corrected simply by slightly increasing the level to the other speaker. The differences in length that could exist in home use don't even cause that problem.
As he says, Mr. Russell's table is based simply on not having the wire resistance exceed 5% of the speaker impedance, which works well in practice. It isn't meant to be a precise measure, which isn't necessary or even possible.
