Cable lengths

By coiling the excess cable are you conserned about magnetic field generations affecting the sound quality? In addition my problem will be the system is in our living room and my wife will kill me if any more cable is exposed. I already have my receiver antenna sticking out of her plastic tree.

NO, not magnetic field generation! By coiling the cable you are making, well, a coil! This increases the series inductance of the cable, rolling off the highs.

What you do with your wife and your antenna, is another matter for a different group, I think! ; -)

_-_-bear

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.