I love my audio. But recently I have been hearing a harshness. My system is a Intel NUC running Roon Rock. Roon Rock feeding Benchmark DAC 2. Benchmark feeding a vintage Krell KSA 200S amp via balanced Hero cables. Amp driving Watt/Puppy 5.1 speakers. Simple music sounds great. Single instruments, single vocals. But when the music gets complex, vocal harmonies, multiple instruments I hear such a raspy sound. I tried measuring amp with REW. Less than 1%. I tried measuring overall system using UMIC mic and REW. Still less than 1%. Tried swapping out speakers and cables for PSB Alpha B1. Still sounds raspy. Replaced Krell KSA 200S with First Watt F5 fed by single ended RCA cables. Still sounds raspy. Swapped out Benchmark DAC 2 with Dragonfly. Still not sounding good. Replaced Roon NUC with my Cell phone running my FLAC files using VOX app. Still sounding distorted. So I think I have replaced every component in the whole system chain with no good result. I am worried that maybe it is my hearing. I have not yet done any I.M. Testing. What am I missing?