^^ I know what you mean, The T75's have huge amounts of peaks an notches that are insane, theres a peak in the upper mids that charts out to 0 db (absolutely no resistance for to that frequency) and another notch that completely slays the 700 area by at least -12 db, and even though you don't want a speaker to be linear, it needs to have a relative flat or even response, massive cuts and boosts are a very bad thing for the tone. This is in the Eminenece remake of the T75's, I graphed out a sweep wave with one of my speakers and accounting for mic and preamp coloration they are just terrible. Don't know how much better the real celestions are, but from all the Marshall 1960A clips, it can't be too much better, they sound phasy as fuck.