Speaker wire does not affect sound quality when used as intended, but some circumstances may affect the sound quality or volume. Scientific evidence does not support the (misleading) concept that "special" or "audiophile" speaker wires or expensive wires create a perceptible difference in comparison to inexpensive, decent quality speaker wire of the proper gauge. If you replace the speaker wire with non-standard wire or cables, there is a possibility that the sound alters, but only slightly. Moreover, a wire that is overly lengthy or has a high resistance can affect the sound by causing the speaker volume to drop and altering some other features. It would help if you did not coil lengths of speaker wire since doing so can produce inductance, suppressing some sound frequencies like that of a crossover. It is important to have a relatively small length of wire between the speaker crossovers and the speakers. The crossover's behavior can change, and excessively lengthy wires can alter the sound response of the speaker to the crossover and the speakers.