Clean mains is crucial
We know the streamer’s capabilities so we hear immediately if a customer’s system is pulling it down. Mains supplies and their problems are much more complex than you might think. A simple filter and one or two decent cables will not be enough in a high-performance system. Radio frequencies and vibration travel on the mains directly into the heart of all components, interact with the music signal and destroy information.
Fact: a simpler system with clean mains will trounce one with expensive components but running on mediocre mains quality.
Advice: start with the mains. That is your primary source. Better major components reveal the damage caused by contaminated mains, especially if they are treated by ‘filtration’ techniques that introduce other problems.
Upgrading the big boxes is tempting but they won’t reward their cost unless the ‘fuel’ is clean.