LOUDNESS 



397 



20 40 60 80 100 120 140 



LOUDNESS LEVEL OF EACH COMPONENT- DB 



Fig. 6— Complex tones having components widely separated in frequency. 



40 60 80 100 

 LOUDNESS LEVEL. BOTH EARS-DB 



Pig. 7— Relation between loudness levels listening with one ear and with both ears. 



