Mrtennis, could you please list your entire system?
" If it sounds good it is good ". That may be but it doesn't mean that it can't be improved. We are not only talking about big difference but also about fine-tuning, if I got it right.
In any case, stable and clean current from the wall or battery is far more important than all the power cords in the world. When the current is really bad, my stereo sounds like a good very expensive boombox, and when it is good - well, it sounds very good.