Cable lengths

I use two different lengths in my room and actually they are two entirely different cables and there is little to no difference at high volumes. At very low volumes one speaker is a little louder than the other.

that should be a good closing statement for this thread

By coiling you create an extra inductance which is so small that it can be just neglected for audio freequencies.

On the other hand the difference in volume level tells that loads to an amplifier are different. To decrease this difference you should use thick 10AWG or even thicker speaker wires/cables.

I have posted this before but... Here is an interesting article on the subject. Click the link below.

Equal Length Speaker Cables - Are They Necessary?

Now I remember too, Bwihite about that article.
Moreover, It's almost impossible to find a HT system that uses equal speaker wire runs for mains, sub, center and surrounds(ABSURD!)