I am surprised not to see Ice Age power cords mentioned here. They are well made and relatively inexpensive. They are cryo treated and come in various configurations carbon/ copper, copper/copper, silver/copper, etc. I have the copper/silvers on my Martin Logan Vistas and the copper/copper on my Marantz SACD player. A significant improvement all around, but the copper/copper on the Marantz was really surprising: better bass, a more dimensional sound and a deeper sound stage. Highly recommended for less than $150.