I'm sorry man, but you have no idea. I'm sorry to be so sharp, but I don't appreciate such a post when I'm going out of my way trying to help you with an EQ for your Android system that won't accept filters below 75Hz. That is what I've created for you, don't blame the messenger - if you don't like the Harman 2019 v2 Target Curve then say so, as my EQ I gave you was a totally valid EQ, and an elegant one at that, to that Target Curve and allowed you to not use any filters under 75Hz - which was the problem you stated. If you don't like the Harman 2019 v2 Target Curve then say so, but don't diss my EQ because it is an exact representation of that curve whilst allowing you to not use any filters under 75Hz. If you don't understand what I'm talking about or why that's the case, then you do indeed have quite a bit to learn about EQ. If you do now understand what I'm talking about, then you will realise it's been a misunderstanding.
EDIT: you don't need a negative preamp if you're matching the measurement on the curve at such a point that I did, which is the only reason you were able to get away with a Harman 2019 v2 EQ without using filters under 75Hz in the first place, lol!
(Sorry, you do have quite a bit to learn about EQ, which is fine, just I don't appreciate your attitude when I'm giving you a very elegant solution to your problem.......now if you don't want an EQ to the Harman 2019 v2 curve then make that clear, but my EQ is 100% valid if that's what you're after.)