More space between the conductors (Live, Neutral and ground) the lower the noise floor
Radiated or induced electrical noise is proportional to area between wires, To lower electrical noise pickup Live and Neutral should be as close as possible. Twisting wires reduces noise pickup further by exposing both wires equally to electric or magnetic fields, it also reduces inductance further. It might seem unimportant for power cables, but LPS current is not a sinewave but short spikes of high amplitude. When amplifier demands 5A - spikes might be in order of 25A or more. Average will be still low, but higher voltage drop during spikes can reduce dynamics. These spikes also produce much higher losses in power transformer - losses in windings (higher rms/average ratio) as well as in core for eddy currents and hysteresis (higher frequency content). Because of that LPS transformers have to be oversized. Of course using 10ga cable will make little difference if home is wired with 12 avg.