Unamplified listening acoustic music HABIT is key...
Timbre perception is the key factor...
Engineering audio vocabulary is USELESS to tune acoustically an audio system....
Speaking about "bass" or "highs" end of the spectrum made no sense, save to compare 2 amplifiers or 2 pieces of gear... This is USELESS in listening experiments and experience in acoustic...
Acoustic is the sleeping princess and all pieces of gear are only the 7 working dwarves...