@ionna22 "Let's talk about power cable. 12-gauge wire resistance is 0.01588 Ohms per 10 foot. Accordingly to the law, 10-foot round trip with a 5-amp load (that is 120V x 5A = 600 Watts) has a voltage drop of approximately 0.16 Volts."
your calculation is valid for linear load only, such as incandescent bulb! in the area of sound amplification, the only 2..10% of AC sine wave time is used to charge capacitors bank. higher SQ amps typical capacitor charge time is much shorter than cheap/low SQ ones! that’s why p-p voltage drop in amp power network is much higher, comparing to purely resistive load. at the same power.
short "cable only” resistance typically is less important than interconnects, which includes inlet/outlet paring, thus good quality connectors are beneficial for SQ overall.

