If they are not the same, then assuming you have a power conditioner with an IEC, the best one should go between it and the wall outlet. The power amp is second IMO. I do not wish to spend the money to get a great cord for each component, so I got one great one for the wall/conditioner and lesser (but still good) cords for the rest of the system. The reason I think the best cord should go there is because that is the one place that will affect the character of the whole system.