Teacher Yao: means no offense. I appreciate your pursuit of ultimate cable performance, but I don't think the common cables and the expensive cables can make an audible difference even in high-end audio systems. The reasons are as follows: The impedance-frequency curve of the expensive cables and the common ones has the same trend, and the effect on the input signal is that the noise and the signal are attenuated at the same level, the SNR is unchanged. They will only cause a small SPL difference. 1) The power cable is only an energy input. Its impedance will only cause a small voltage drop at the input of the equipment. A qualified power supply design has enough wide voltage input range, which for the common transformer is about 10%, and for the switching power supply is wider. The impedance difference between the two power cables you listed is 60 -20 = 40 mΩ at low frequencies. Under 220V power supply, even if the power requirement is 1kW, the voltage drop are 0.06 / (0.06 + 220 * 220/1000)