I wrote some comments in another Circle recently about my experience with the incredible Schiit Loki Max equalizer. I find that it makes a great difference in compensating for not only my room's deficiencies, but also the frequency losses my 72-year old ears have given up. Because I often listen with others, I also have settings that are compromises between my hearing and that of others, and I can also bypass the EQ entirely without any sacrifice of quality. It was an excellent investment of $1500.