AudioQuest NRG-4 from Power amp to AC outlet. Most noticeable improvement compared to other components.
The following have been used on different sources CDP, Streamers, Preamps. Can’t confirm noticeable improvements but just didn’t want to leave anything on the table for a minimal investment per component. I am a firm believer in the sum of all parts.
AudioQuest NRG-Y2 2-Pole C7
Shunyata Venom 3
Shunyata Venom V14
Audience Forte F3
Cardas Iridium
All are well made power cables with reasonable flexibility and under $200 available on Music Direct, The Cable Company, etc.