Over the last year I upgraded all my cables, interconnects, and power cords (see my system under ID). I have contemporary (Gen 6? 5?) Transparent Ultra. On power cords, I compared WireWorld, Cardas (several levels), DH Labs, JPS, and Transparent. The Transparent won… making a noticable difference. But the big one has been the amp power cord. It makes by far the biggest difference. Here Transparent didn’t win… and I believe it is because I was not using the XL… made for amps. The Cardas improved bass… but attenuated the detail. I really struggled for months. Finally my audio guy brought over an Audio Quest Monsoon… that made a big improvement over the Cardas and Transparent. The Monsoon makes a huge difference. The difference I hear in the amp power cord is 3 or 4 times the difference in components.
The state of the art is to get power cords made for the purpose… low current apps… like a DAC… where noise reduction is key.. or high current… like an amp. So, if I were you, I would start with the amp. I would try a Transparent XL made for an amp. I suspect if I had tried this first it might have been my choice.