Darko's A500 Review notes a setting that tilts Highs / Lows at low levels.
" Buchardt’s ‘Low-level Enhancement (LLE)’ corrects for the Fletcher-Munson effect where, at lower SPLs, our ear-brain is less sensitive to low- and high-frequency information."
https://darko.audio/2020/09/a-long-film-about-the-buchardt-audio-a500/
" Buchardt’s ‘Low-level Enhancement (LLE)’ corrects for the Fletcher-Munson effect where, at lower SPLs, our ear-brain is less sensitive to low- and high-frequency information."
https://darko.audio/2020/09/a-long-film-about-the-buchardt-audio-a500/