The ESP essence greatly improves my CAT Ultimate in More solid bass, more inner details. Recently, I upgraded to the Shunyata King Cobra. It takes the improvement made by the ESP up even further. Give it a try.
I have the Ultimade version. I am currently using the ESP essence with excellent result. The bass is even more solid, more details and quieter background. The difference is not subtle at all. Give it a try. This power cord is actually recommended by Ken Stevens for the CAT Preamp.
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