Altitude training: Even the strongest heart performs badly if it does not have enough oxygen. Power supplies are the lungs for high-end enjoyment. Power supply cables are increasingly used to carry data. High frequency signals are superimposed on the mains voltage. Normal power cables also function as aerials, picking up the radio frequencies broadcast by mobile phones or PCs. These signals then manifest themselves as interference in the hardware. This is compounded by mains voltage variations and transfer resistances, which impair the power of hi-fi equipment during dynamic peaks.

And, as everything should be through to the end, power cables, power strips and even voltage regulators have been developed for audiophile listeners.