Replaced all Harmonic Tech cords with Sidewinders in system consisting of Sony SCD-777ES, EVS Attenuators, Bel Canto amp, Ps Audio P300 and B&W speakers. Everything was improved by Sidewinders. Bass output was more extended and system speed/transparency was improved. Purchased from Goldmanaudio.com. John Goldman is easy to work with and puts his customers first. One Black Mamba in system such as on CD player is recommended.
MY Sidewinder AC cord progress:
This is a demo from the Cable Company. They burned it in for 250 hours, and sent it to me. I plugged my Krell amp into it, and directly into the wall outlet. After a 24 hour settling time, I listened. Very bright, dynamically laid back, zero bass in the bottom two octaves, wide and shallow soundstage (that's a function of the brightness, IMHO). So far, not the best AC cord I've tried with my amp. MORE LATER....