I assume the answer to this question is yes. But I wanted to ask anyway. Should I use the same length cables for left and right units? So if 1 amp is say 18’ from the P20 and the other is 3’ I should still use same length power cables, as well as speaker cables and XLR? I assume yes since different length have different resistance, inductance and capacitance and not matching could through off timing of system.
I would keep the signal cables, the XLR and the speaker wires the same length, but just use shortest power cords that you need.
I suppose you could put on a mono source, and listen for any differences in the sound.
In my opinion, there won’t be any.
I have always been in favor of using same length cables despite the actual required length. Maybe it’s just my penchant for symmetry, but it makes me feel better.