@whart I'm still curious about horns/sets as a combo.
I have since discovered that small peaks (around 3 db) at certain frequencies, in the mid’s and low mid’s can add a richness to vocals and that certain dips in the mid’s can remove a hollowness from vocals that can show up from time to time.
The assumption of a flat response is a fundamental mistake I made, too. Your post reminded me that in addition to measuring a room and *not* worshipping a flat curve, it was also helpful to measure my hearing -- with an audiologist. I don't believe that measurement is the last word, but knowing the curve of one's hearing can help guide anyone adjusting the curve of their room.