Agree with whoever said power. After I tweeked everything else added EquiTech 2RQ. Was blown away. Made a bigger difference than about every other change combined. Don't care how top end your setup is, if you are feeding it noisy AC, your gear is operating with one arm tied behind it's back.
What makes the biggest difference in sound quality?
When making changes or adding things to your system, what makes the bigger difference in sound quality on preamp‘s and power amps? Interconnects, speaker cables, power cords, or fuses?