I agree w/ Hassel that the sonic improvements of the EP/SP override any subtle differences you'll hear between PC's -- with one exception: actually two:
1.) "The bigger the pipe, the better the flow." If you are using a 20A circuit (dedicated or not) it is house-wired with 10AWG per code. So IMO, always use a cord that's 10AWG (or bigger) to and between the power units and for your amp(s). Also, for reasons I don't understand from an engineering standpoint, CDP's and DAC's seem to like large wire sizes too. In any case, I recommend minimum 14AWG for equipment other than amps, conditioners, CDP's and DAC's.
2.) Even using a balanced power unit, when powering anything digital (including preamps etc. with digital readouts) always use a PC with a shield -- a shield that's tied to ground at the AC plug end and "floated" (disconnected) at the component end. Check with the manufacturer if you're not sure, because a lot of them don't say in their technical descriptions.
2a.) To the folks who argue that no highend mfr. would supply a crappy stock cord: in most cases they're right. However, look at the cord. It will state the AWG size and whether or not it's shielded. Except, if it is shielded, then there's a problem: in order to get a UL approval, the shield must be connected to ground at both ends, creating a ground loop. If you want to fix this, and save yourself some money, carefully remove a one inch section of the outer jacket near the component end and carefully cut out the shield. Then cover the wound with several turns of electrical tape, and you've got yourself a pretty respectable shielded PC.
1.) "The bigger the pipe, the better the flow." If you are using a 20A circuit (dedicated or not) it is house-wired with 10AWG per code. So IMO, always use a cord that's 10AWG (or bigger) to and between the power units and for your amp(s). Also, for reasons I don't understand from an engineering standpoint, CDP's and DAC's seem to like large wire sizes too. In any case, I recommend minimum 14AWG for equipment other than amps, conditioners, CDP's and DAC's.
2.) Even using a balanced power unit, when powering anything digital (including preamps etc. with digital readouts) always use a PC with a shield -- a shield that's tied to ground at the AC plug end and "floated" (disconnected) at the component end. Check with the manufacturer if you're not sure, because a lot of them don't say in their technical descriptions.
2a.) To the folks who argue that no highend mfr. would supply a crappy stock cord: in most cases they're right. However, look at the cord. It will state the AWG size and whether or not it's shielded. Except, if it is shielded, then there's a problem: in order to get a UL approval, the shield must be connected to ground at both ends, creating a ground loop. If you want to fix this, and save yourself some money, carefully remove a one inch section of the outer jacket near the component end and carefully cut out the shield. Then cover the wound with several turns of electrical tape, and you've got yourself a pretty respectable shielded PC.