I ask this because I’m thinking I could somewhat correct those cans I have that are shall we say, “lackluster in some frequency or other”? Funny that my least expensive cans ($50), are the most articulate, accurate and neutral to me. Makes me wonder what the excuse is for my more expense cans. Anyway, I don’t use a computer as a music source much of the time, I prefer vinyl records and CDs hence the two headphone amps I have hooked into my two systems. I know how to use EQs and all, but there is the age old underlying problem, which is that most EQ units have always introduced noise or other unwanted anomalies. I do not want to incorporate an EQ unit into my system main circuit train either, just something for the headphones. Is there such a unit? I have had no luck in finding one. There is the Behringer FBQ800 or something, but I am afraid it comes close but no cigar. It has no headphone jack and therefore would not be installed into the spot I need in the chain. I have the feeling what I seek is non-existent.