Bought the HD 660S2 new at a big discount and has enjoyed it for a week with a FiiO M33 and Fangsound Silenos: very vocal-focused and dark, missing some treble energy but fantastic for heavier music, and Dekoni Elite pads helped the low end.
“Bought new heavily discounted just received the dekoni elite pads for these and it certainly helps the lower end out, these are very vocal focused, and pretty dark sounding, definitely missing some treble energy but fantastic for heavier stuff.”