I will not name the power cables I used before because I do not want to down grade other manufacturers' cables but the difference was dramatic to say the least.
The first thing I noticed with the ESP Reference-II power cables was the center image was rock solid. The instruments on jazz recordings had more air around each separating them from each other reducing smearing. Moving on, every album I played was more alive and had energy with more body that was lacking with the previous power cables I was using. It was like removing a small layer of grunge from the musical signal. Transients were also much faster with the Essence Reference-II power cables.
I did not think power cables could make this much of a difference to my system but the Essence Reference-II cables did. I whole hardily recommend the ESP Essence Reference-II power cables to anyone wanting to make a significant upgrade to their system.
Gary Jones (USA)