Per my conversation with Audioquest, the best power cable should be on the source.
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"That would be the DAC, as opposed to the transport"
Not necessarily -- in a full DCS stack the best place for the first power cord upgrade is on the clock ...
The obvious answer is where the influence of greater power stability will be most impactful but that also depends on how the power supplies themselves are designed.
Unfortunately you probably have to try but as a rule closer to source (i.e. in the original question that would be the transport actually) as any problems created there cannot be corrected downstream
Depends on equipment and cords. No definite general answer. Listen. I would start by putting the cord on the preamp first, then move upstream step by step. After that to power conditioner if you use one and then to power amps. Unless specifically designed for digital, transports and dacs, good heavy gauge cord should work well everywhere. Purist Dominus cord that I have works best everywhere ! I left it on the integrated unless making recording from vinyl to tape - then I put it on the phono stage. I record directly from phono, no tape-outs.
I have a Vitus integrated amp and separate CD player. The biggest effect was on the CD player. A huge difference on some power cords (Shunyata especially). On the amp the power cords had less effect, many had no effect at all. An improvement in the bass tautness was the main effect on the amp (again Shunyata was the most effective).
...first of all: EVERYTHING ( Electronics, interconnects and speaker cables, powercords) NEEDS SOLID BREAK-IN TIME.
I do 300+ continuous hours before any serious listening.
Find a dealer or friend who will let you experiment with different combos; vary your music greatly, and vary volumes you listen at.
BE FORWARNED: THIS IS TIME CONSUMING PROCESS AND SNAP DECISIONS ARE USUALLY SHORT-LIVED.
My present choice of power cord into my JOB INT AMP is a PS AUDIO SC STATEMENT...
Some or most power cords need in fact more than 300 hours to reach their full potential, but yeah 300 hours should get you most of the way.
Shunyata power cords are widely considered among the best overall. I thought about getting one but then the Dominus came up. I could use couple of better cords, though, on the phono and PS Audio regenerator. But this would be expensive and not so easy, Custom Power Cord Top Guns that I have are quite good, so it would be at least $500-$600 each used, thinking either Purist or Shunyata.