Several posts above state "where the PC makes the most difference" - which is the best approach
This can be the source or the main amp
- many amps tend to have a heavy duty transformer/power supply, so adding a good power cables may not make too much difference
- the better the power supply then a significantly better power cables will be required in order to hear a difference
- many sources have a crappy litle power supply, so adding a good power cdables will improve things significantly
- in this case a lower quality power cables will make a noticeable improvement
- and of course the reverse may also be true
So figure out the quality of the power supplies in your gear and make an educated assessment
Take a look at Zavfino power cables, they are extremely good
Regards - Steve