When is unequal, equal?

Sweet, then the question is moot. I can in fact run different lengths without loss of information. Thanks

Some cables like OCOS, for instance, impose no penalty for unequal lengths. I think the same is true for Silverline. See if your dealer offers any for a home audition.

I wouldn't be so sure of the speed of light thing. While it is true, it is not the speed of the electricity traveling through the wires that is a concern, but the resistance, capacitance, and inductance, which are functions of length.

A difference of 8 feet will not make an audible difference. This is easily shown with the math, but without the boring details:

Assuming the speakers have a 90 dB/2.83V-m sensitivity at an 8-ohm nominal impedance (1 watt) and that the speaker cables are 14 ft and 6 ft of #12 copper, the voltage drop to the furthest speaker will result in -0.035 dB. If you're 8-feet away from the speakers, you can compensate for this by moving that speaker a quarter of an inch forward. I didn't take capacitance and inductance into account - I don't think it will make a difference, but I could be proven wrong.

Good work, GS. Every time you move your head while listening, you have a greater effect on the relative weight and timing of the sound reaching your ears from your two speakers than anything caused by a modest difference in cable lengths. In other words, if you think equal cable lengths matter that much, your listening chair should include a head-vise.