My demonstrations for the following cables were performed in a local dealers showrooms. Since then I have owned and auditioned many different power cables.
My first experience was with Shunyata Research’s Black Momba power cable demonstrated on a Naim Audio Classic series seperates system. The Momba was powering the amplifier driving Thiel speakers.
My second experience was the Nordost Vahalla powering an Ayre Acoustic Ax-5 integrated amplifier driving Aerial 7T’ speakers.
In my system aftermarket power cables along with Synergistic Research Purple fuses considerably enhances the performance. ymmv