Low levels will never sound right as explained by someone earlier our ear frequency response varies with level and bass and treble are softer than middle frequencies until about 100dB
The correlation between sounding right and 100dB is utter nonsense. My "listening room" is 60ft w x 25ft d open plan (minus a 17x17 ft bedroom with doors on 2 sides) and you can hear the music clearly throughout the house/in the bedroom at 85dB, never mind 8-10ft from the speakers which is where the sweet spot is.