Interesting about the Loki. I bet it could be useful on some recordings that present problems.I have some occasional tinnitus and hearing damage, very likely from loads of concerts my father took me to in the 1980s. I believe that the hearing damage has petrified into me being very sensitive to sound (voices and instruments) in the 4kHz to 6kHz region.
As you know I have struggled with what I perceive subjectively to be a slight edginess in the 4kHz to 6kHz region of my stereo system. Interestingly I hear this edginess more than anyone else hears it.
I spent this afternoon and evening playing with a Schitt Loki Max on the big stereo.
Here are the current settings:
120Hz +2dB
400Hz +2.4
6kHz -3.6dB
While the 4kHz to 6kHz edginess is totally gone, I also like the additional bit of warmth from raising the upper bass to lower midrange region.
I am hearing a slight diminution in transparency through the Loki Max. (On its own terms the Loki Max is a fantastic product at a very reasonable price!) I assume EveAnna Manley's Mid Frequency EQ device would be more transparent than the Loki Max.
Two recent listening example for me: John Adam's, Son of Chamber Symphony where an energetic piccolo comes in at times that has too much bite for my ears. My intuition is that it would probably have the same effect (or worse) on me live. Another example from Cat Power Sings Dylan (on only one track) the harmonica gets a little shrill. The harmonica on the other tracks is fantastic.
I think my ears have grown more sensitive to high frequencies. The other day a Cardinal decided to fly under our porch overhang and commenced calling with an urgent and intense high frequency. I couldn't tolerate it.
I don't think this would have bothered me when I was 30. An audiologist who checked my hearing recently found it to be good, but explained as your ears get older, their ability to modulate (close down) in response to very loud sounds will atrophy a bit.