I have been having that same problem for about a year now. IMHO it is your ears.As we age our hearing changes as mine did and now at almost 65 I have no choice but to listen to your music with a background hissing ( tinnitus).Believe me, I did so much experimenting (and very costly) to finally accept my tinnitus condition after seeing an audiologist.BTW, I have the Weiss 501 with all the room improvement features and it’s not the room but ears. My friends tell me my music is crystal clear like they never heard before so on that note I accepted my condition and decided to stop looking and spending and JUST ENJOY THE MUSIC 🎶🎼
