It probably sounds good with the stock cord but wow if you can't hear the change in sound from different power cords you need a new hobby. I'm always like and I'm out on that guys opinion forever when they say power cords or any cords don't make a difference to the sound, and chances are they are just talking without any experience. The Sit 3 will definitely respond to different power cords. On the cheaper end of the spectrum I like the Audio Envy power cord.
Power Cord recommendations for a First Watt SIT3
Anyone with a SIT-3 have a power cord recommendation?