Upgraded power cables- Who's on First?


Just wondering...If you have 2 upgraded power cables to use where is the the best place to use them? Wall to conditioner first?
Then cdp to conditioner? Perhaps preamp to conditioner would be 2nd best choice? I really am too lazy to do hours of testing if someone has already figured this out and does it really matter?
Thanks
128x128blueskiespbd
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Update: Cable ordered. AA said it would take 1oo hrs to burn in. Should I hook it up to the freezer?
I cannot upgrade the two amps because they are hardwired. everything else had been upgraded.
Next I should look at the speaker cables. One pair (biwired) is top line Straightwire and the other is pretty old Monster Powerline 2 I believe.
Is it important that they match?
Please let me know your thoughts on the Pangea. If you hear a difference, I will consider a purchase. Thanks.