I need to run 3 45ft runs of speaker wire for my main front 3 speakers, but for my surrounds I could go as short as about 15-20ft. Can I make the surround speaker wire length shorter than the mains without any audible difference, or should I just make all the wire runs at 45ft to keep them all even? Also I have been told it is not good to coil excess wire because it can be bad for the current going through the wire and ultimately degrade the sound for that speaker. Is this myth or reality? If it is reality, what is the best way to deal with excess wire so there will not be any harmful consequences to the sound?